That looks like a lot of fun! In particular I noticed the accuracy seems to work better. Units no longer have stormtrooper accuracy. Even a miss is still fired in the target's general direction. How does the mod accomplish this?
a lot of things to take to account:
1- midcampaign mission some unit´s are veteran (very good acu by this point)
2- stat string´s help i choose units with good accuracy for long range weapons (flamers and shotguns go to acu noob´s)
3- improved the bolter acc all around
4- use of sniper
5- devastator armor gives bonus to aim
i guess it was testing and balancing all around