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...cost stamina, just like sprinting. On top of that, maybe add a slight delay after, say, second or third jump. Alternatively, instead of a delay, allow jumping only on keypress, but no automatic key repeat.
Having people jump around the whole time is really annoying, and being able to do it by simply pressing and holding a button only encourages it.
It would be nice if jumping would cost a sizeable chunk of stamina (for example, 10-20%), so you could still jump (and multiple times too, if needed), but can't simply press button and jump indefinitely.
After all, sprinting, pulling bowstring or weapon swinging all cost stamina (great concept there, by the way, please keep stamina separate from power in CU!), and jumping should be no different, in my humble opinion.
Birger, Galahad, Healer