I don't currently know where to find it, but back in the day I had a script that was in game that would automatically switch to fly when moving with wasd and automatically switch back to hover when not moving. Was wonderful for playing a flying blaster, because it eliminated the accidental acc debuff from leaving fly on.
Fly only had an acc debuff for, like, a month as I remember it.
Scratch that, I remember now. Fly had an acc debuff from launch or so until travel suppression got implemented; it was Super Jump and Super Speed that only briefly had the acc debuff, before the devs settled on travel suppression.
Oh is that what happens now? It's been so long since I've flown. Most of my characters end up jumping.