not completely sure what are you asking there, but gamesys.dml can be used to modify (some, not all) gamesys settings and values without modifying the gamesys itself. this can be very useful for testing (if you break something, you just delete the dml) or for trying out experimental features. do note that dml is basically a programming language, so if you do not have experience in that area it will probably be quite difficult for you to actually create working fixes.

let me give you an example - the Thief1 Maw portal fix.

- first, we need to fix the borked creature positions on the cocoons that already exist in the level (the code goes to miss14.mis.dml): this will screw up the size of some cocoons, so we need to fix that as well: some waypoints also need to be moved so the creatures won't get stuck: now, we need to do the same for all the creatures that are going to be spawned from the moment the level starts until it ends. this is controlled by the gamesys (gamesys.dml). and you are done. and this is a very simple, basic fix - basically, it just tells the game to move a bunch of objects around and adjust their size.

there is no such thing as free lunch in the Dark Engine.

here:
http://www.systemshock.org/index.php?topic=4185.0

One of the mods here needed me to config a gamesys.dml but I never had one so I made one myself

yes, all you have to do in this case is create a text file, copy the text, including DML1 and all {} into the file, and save it as gamesys.dml (in the root SS2 folder). the settings should be applied next time you start the game.

Works like a charm :)

But I've read somewhere that some mods doesn't even support gamesys.dml files, so ti be safe I asked

dmls are not mod dependent - if you write a dml that will increase hybrid's hitpoints twofold, the dml will apply it on the game, and therefore on all currently active mods. however, some mods may require specific dmls to work properly (like the nurse Bloome mod, which adds a special model for the Bloome midwife, and it uses a dml to do so), so mods may be dml dependent.

Thanks Voodoo

Heads up for systemshock.org (if you hadn't seen already):

http://store.steampowered.com/app/238210/

Yeah, good luck on modding your game when it's on Steam that overwrites your custom files each and everytime you start up that DRM infested crap program. Glad I have it on GOG...

updating to the latest version with ss2tool should work fine, but modding might be a bit more problematic.

Not true. I have modded several STEAM games with no issues.

Unless you're messing with the main .exe file modding Steam versions of games is usually no problem whatsoever.

all I can say is that steam is not exactly friendly to TFix.

Don't want to derail, but what specifically were the issues you had Voodoo? I turned off auto-update and didn't have any problems with TFix or Tafferpatcher. Honestly, haven't had a chance to play that far into either, but was curious if there's something specific I should be watching for.

the most obvious symptom is the broken options menu. and yeah, turning off auto updating should help, but nobody really confirmed this fully. until now.

Mods work great!