There you go with your assumptions again. Calm down.

I would agree it makes it easier, but given how horrible I am with combat, I welcomed that! I had to remove the level cap the first time I played BG1 anyway to win it. I got all the way to the end and just couldn't beat Sarevok. I ended up starting over again, removing the level cap and adding a few content mods to get some more XP and I still barely beat that guy!

Most of "charges" against BGT aren't really that solid.
EXP gained - BGT limits exp for locks, traps and spells significantly. You are able to switch it off totally (for the whole game of course)
BG1 part limit - you know there is something called "hardcoded exp cap"? In BG1 essentially it was some 161000 iirc, you could've remove it with .exe modification. Now BG2 had it too. IIRC 2950000 exp limit. But since ToB there isn't one - you can go all to level 40 (which is not hardcoded) or with TDD/EoU etc up to 50. There's no hardcoded limit and no way to implement it selectively to BG1 part. If you think that spoils all the fun from beating Sarevok there's a mod that would make them "a little harder" ;)
Ammo stack - nope. BGT uses BG2 behavior "out of the box". In BG1 part shop stacks are still 20 rounds but once in equipment they indeed stack up to 40. Any behavior other than that is no standard (so I guess you switched some option to make it "bg1 ammo stacking". It WILL go all game along! There is no way to switch it selectively in BG1 part. And IMHO there is no point in making so! The whole point of the mod is to make all those changes BG2 brought to us available in BG1 and provide continuity between those two. It is done. I believe "silver" is one way, +2 or +3 enchantment the other. Remember some weapons +1,+4 vs X in reality are +4 enchanted! There's no "selective" enchantment, only hit/dmg bonus so enchantment in many of those is calculated as highest to hit bonus. You can then use bastard sword Kondar you can get really early - it has +3 enchantment. There's also Xan's moonblade (also +3 but only usable by Xan who is PITA). Kiel's morningstar (+3 also), cursed two handed sword of berserking (yes, +3), flame tongue long sword in DT is +4, short sword of backstabbing from Slythe is +3 weapon, balduran sword is +2 but cold iron/silver enchantment so effective against greater werewolves.
All of that I wrote based on RINGLOUP.ITM properties which makes user invulnerable to any weapon with enchantment +2 or lower. Didn't observe increasing healing rate each reload but... greater wolfwere (and probably werewolf too) has incredible healing rate, I remember meeting 3 of them for first time in windspear hills (bg2) resulted sudden death of all my party with "slightly injured" wolfweres after A LOT of punishment by a kensai charname, minsc, jaheira, yoshi&traps, nalia and anomen). Nope. The quest goes on... maybe you didn't speak to that thief level lower so there was no option to "kick in" in dialogue. Normal behavior. You either start out with what u left in BG1 (no reset) so after joining all options kick in like if you did plenty of good/bad deeds in a very short period of time (so mild annoying Jaheira with 13-15 rep and heavily annoying afterwards) or you start out with typical rep for your class and alignment (so for lawful good pal it's some 13 iirc, chaotic evil dwarven berserker probably 9 or 8) that already makes some annoying comments by NPCs after joining. Again - you probably switched some "additional item transition" option. After "core bgt" is installed there's regular BG2 behavior - so only helmet and horn of kazgaroth (or some other items, can't remember atm which CAN transit to BG2 but really not all that much you wrote in your post). Believe me they fought with it a LOOOONG time and I think it's still present if you choose "bg1 style spawns". Well if you feel that way try reduced to 70% exp (there's 30% option too iirc) and maybe some SCS. Small group of ruffians with one mediocre spellcaster can become a real PITA. I recommend no DSotSC/NTotSC but instead BG1UB and BG1NPC.

I don't know what you base this information on, but it's false. There is no 'hardcoded exp cap': in all games they are controlled (and changeable) in XPCAP.2DA and XPLEVEL.2DA.

Well I might have remember it wrong but back those days there weren't any "simple .2DA" editors. And as for starting XP on BG2:SoA and BG2:ToB - those indeed are hardcoded, and so is max 50lvl on BG2 (can't go past that no matter what 2da modification u make), max 40 lvl on IWD (or was it 30?), max 20 lvl on KotOR and IIRC max 30 lvl on IWD2.

XPCAP.2DA itself is, however it is packed in BIF file which you cannot open with 7zip or winrar or any other "simple" windows tool. You can however edit it with NI, DLTCEP etc - all those tools were made several years after Baldur's Gate first appeared. I vividly remember using some first cap removers in form of .exe trainer (modifying values in process memory) and working only on certain bgmain versions (pre totsc). That's why I assumed there WAS hardcoded EXP limit.
As for LEVEL cap (you see I am writing about LVL not EXP atm) - go ahead and try to make lvl 60 character with expanded xplevel, xpcap, hpxxx, skillbrd/rng etc. etc. No way. You can't. 50 is max. You can try EoU, you can try TDD, you can try manual edit - all is locked at 50. The same way you couldn't make half-orc monk or barbarian/cleric, elf paladin etc regardless of changes u made to kits and racial files - you can do it now with e.g. ToBEx but that tool basically hooks some .DLLs and changes all those hardcoded limits to configurable by .ini

First, you don't edit the 2DA file inside the BIF. You only need to replace it with an override.

Second, there is little point in talking about levels above 50, since there simply isn't (without mods) the XP in-game to achieve that.

Man, all this discussion is making me want to play it all again!

Too bad I have about 20 games in my backlog already!

Check for the Big World Project ;)

I played a version of that years ago. Amazing stuff.