I cannot say that the game is broken because of this , but Parman as the must have unit on the board has jumped to the front of the allied queue.
We have always allowed Rapid Assualt without the need to attack a unit.
However, I still feel here the problem is the way the Buff is phrased on the printed cards (unlike the rulebook illustration) allowing Rapid Assault but a rate of 3 for all units. At least for now we our playing a house rule that this line is actually Parman's Special Ability and the Buff is Only Rapid Assault (x) where X is that units normal move rate. Parman is still important in getting the Allied units forward but it negates the headlong dash that the 3 move and attack does