Ugh, I hate double-tap dodging. Its bad enough to ruin a game.
Worst most annoying mechanic in UT2k4 both in how it makes characters jerk suddenly with no anticipation but worst of all how it requires tapping the keys to activate it. Tapping is prone to accidental activations and also gives me carpal tunnel after a while.
Add anticipation delay to dodging, a smooth start (ease-in curve) to make it less jerky and make the control input be instead "Press dodge key + direction tap once" to dodge in desired direction. These steps would solve the issues nicely.