So a thing CoH got very much right when it came to PvP was abilities acting differently. Lemme explain.
In PvP Arenas, instances, etc.. Your abilities had different effects than in PvE. One of the best examples was Twilight Grasp. It was a damaging ability that healed you as well in PvE. IN PvP however, it also added a Heal over Time effect IIRC.
On top of this, many ATs got a boost to defense (pure DPS ones getting about 40%, tanks and MM getting 0%). Buffs had diminishing returns, healing gave you a resistance to healing (stacked to 80%) for 8 seconds, hit chance was lowered, etc.. The thing would be relatively easy to code for IMO and changes to powers in PvP mode would not effect changes to PvE mode, leaving everyone happy! :D
Revenge is motivation enough. At least it's honest...
Roleplayer; Esteemed Villain