Just played a bit of HotAC on Friday with the creator and some friends.
Josh wanted to playtest shared XP for kills where you tally all the XP that was accumulated at the end of the mission and divide it evenly (remainder gets distributed point-by-point starting from lowest PS).
His reasoning was that it's more fair to players who want to play as support ships. It also eliminates players racing each other to shoot the 1-hull TIE.
I enjoyed it a lot more this way. There seemed to be more cooperation and talking through who should shoot first etc. And Squad Leader was actually used!