The AI's use of weapons definitely needs to be sorted out, no body should be able to hit shit with assault rifle let alone kill over 800m and definitely not with any variant of the AK. Also line of sight the AI seem to have this uncanny ability of knowing exactly where u are when u get within a certain range even when u have moved in undetected.
I would like to see the hole complement of arma2 & ace weaponry equipment and vehicles added to whatever else BIS are throwing in there. Dynamic weather, night & day cycles as standard changeable via severside just like arma 2oa.
God no to cod-like melee systems. An more accessible way of mantling objects I.e fences etc. More destructibility but not so much it compromises online qaulity and general smoothness of gameplay.
Nothing else comes to mind that hasn't already been mentioned.