Personally I feel RDM needs Embolden to work with everyone to solidify them as the more support oriented caster DPS. Giving acceleration two charges would be fine, but when it comes to Corp-acorps/Displacement/Engagement, I personally think removing Corps-a-corps and replacing it with Engagement, then giving engage/disengage three charges while equalizing their potency would be fine. Let RDM choose which skill they want to dump charges on, they will preserve it for the melee combos in between manafications.