Change the distribution of Companion Bonus Power slots so that they are figured by paragon rather than class, and alter how many of each type can be used.
All paragons begin with a straight 1 Offence, 1 Defence, 1 Utility.
DPS Paragons gain +1 Offence slot.
Support Paragons gain +1 Defence slot
Everyone gets +1 Universal slot to use any one of the three types.
I understand that this would probably lead to most people using a second Utility, but would that really be a game changer?
It would certainly allow for more practical distributions for DPS/Support cross classes and more player choice for individualising characters across the board.