If hotbar space is a concern, I would drop additional actions to make the rotation more job defined instead of everyone picking IR/BfB/Invig/RS/QS and baseline Provoke/Swiftcast/Invigorate for jobs that can use them currently. They could then add 2-3 new abilities and some traits (maybe some oGCDs to replace some of the additional actions that were dropped but with more interesting mechanics/utilities instead of just an increase in dps) while keeping the same amount of hotbar space required as now.