My current mashup of GL4/ASR/TPWC Suppress-LOS/ACE/Blastcore is one of the most visceral and engaging gaming experiences Ive ever had. Ive literally been playing the 2nd mission of ACR campaign for a week now and never get bored!
I'd have to say that highest on my list of hopeful inclusion is the suppression system followed closely by high quality Blastcore like explosions and Ace weapon resting...ASR crouching...ok I could go on quite a ways here
The thing about AI mods is that they can only go so far laterally while real lasting and new improvements happen by the Devs vertically. BI raises it a notch -modders expand out on it.