BGT's quest tracking system is great! It splits the journal into 4 separate sections:
- active quests
- finished quests
- non-quest journal entries
- user notes
BGT still feels enough like the real BG1. The main differences are BG2 ones: combat proficiencies are way more specific, dual wielding is allowed, ammo stacks to 40 (instead of 20), graphics look smoother due to the use of alpha blending instead of dithering, UI looks different, combat now pauses in inventory mode (I think), and you can highlight interactive objects by holding the Tab key.
Steam Overlay works if you run the game in OpenGL mode, although it leaves a flickering mess when you close it - at least until you do something that forces the screen to redraw. Also, it was necessary to disable triple buffering to prevent general flickering issues.
I recommend a low resolution for the widescreen mod, as 1280x800 is almost too small on my laptop's 17" 1920x1200 screen. Keep in mind that BG1 has some pixel-hunting, so it's not always worth the tradeoff to see more of the world at once.