So, I got the Doom 3 BFG package, and decided to relive OG Doom on a whim, and immediately noticed an issue - the Alt keys weren't set to be the strafe keys, or anything at all. After a bit and a little experimenting I discovered that the W, A, S, and D keys were set up as Forward and Backward(W and S) and Strafe Left/Right(A and D), and from there managed to complete "E1:Knee Deep In The Dead" with no further problem, and then went on to "E2:Shores of Hell" and it was then, when I finally decided to plug one in, that I discovered that because the D key was now Strafe Right I COULDN'T USE THE CHEAT CODES! And while I managed to complete E2 anyway, now I'm in "E3:Inferno" and I need a way to you the walk through walls cheat to get a perfect score on items for Mission 4. Unless there's way to get those two crushing ceilings to reset so I can use their switches to raise the goodies up the way I'm supposed to. Little help, please?

DOOM 1 & 2 inside BFG edtion use both a slightly modified version of the original MS-DOS engine.
The 2 main highlights on it are:
- Storing engine state in an C++ Object, allowing it to dynamically restart a new session without keeping anything from the previous session in the same engine session.
- Using ID tech 5's input system (such as the rest of the engine)

Sadly the second part means that the input for all 3 games is the same, which explains why Classic DOOM's movement input is similar to DOOM 3's movement input. As for the cheat codes, without DOOM BFA your bet bet is to launch the game with the console "+set com_allowConsole 1", of course that means that achievements won't work while the console is active

Yeah, I was afraid of that. Oh, well...

Would anyone happen to know if Doom BFG is going to be converted to the new upgraded version of Doom 3 that we are already seeing on Steam and Epic?

I am playing the enhanced version and the original simultaneously, and the upgraded version definitely seems much better so far. This is in contrast to my experience with other so called enhanced editions which I inevitably find to be worse than the original.

The enchanced versions of DOOM 1 & 2 are ports to the unity engine. The "updated" DOOM 3 is just BFG Edition (assets and possible code) minus multiplayer and the Classic DOOM games

One minor (although significant in my opinion) improvement that 2019 version of DOOM 3 it has over BFG Edition is that sprint is a toggle on controller whereas you had to hold the button which is defaulted to the Left Stick Button and I'm not a fan of holding my stick in to run, does not feel comfortable to me. Unfortunately the developer console is completely disabled in the 2019 version; even the unlock console CVAR won't change anything. It sadly doesn't work with CstDoom3BFG which has became more and more of my preferred way playing Doom 3 BFG Edition since it has a lot of quality of life and bugfixes that other BFG Edition source ports (even BFA Edition) doesn't have.

Now that I finally resolvd the issues with SDL2's controller input I guess I can start looking at them (toogle sprint seems easy enough)