I like the idea. And it really wouldn't nerf archers significantly. I mean, fuck, its not like an archer's sole job is to begin running away the moment enemies are spotted in the distance, and then begin jump shooting. The jump, spin, gay technique generally happens when the fights almost over, and, lacking the support of the normal, manly infantry, the archers must run away.
And they would still run, if this suggestion were implemented. They could even draw while on the run. They could still kite.
But they couldn't jump-gay.
NERF CAV NERF CAV NERF CAV (almost forgot)