I think Virgil mentioned that GE's instructions say you can remove the bar between the 2 neutral busses in their load centers but I don't use GE and have never seen this in any other manufactures instructions. Every loadcenter has a listing for ad on equipment ground bars. The neutral gets bonded through the optional screw that gets installed through the buss into the enclosure so there is no reason to separate these busses. Use both busses for neutrals and ad an additional buss for your equipment grounds.
Curt
