Perfect gaming keyboard:
Keys should work reliably. No failed keypresses. No bouncing.
Force. Light as possible without getting accidental presses.
Travel. Shorter the better for gaming performance, if truth be told.
Tactile feedback. Irrelevant if you're mashing keys. Useful if you don't and if it genuinely confirms a keypress that might not otherwise be obvious in-game.
Audible feedback. Same as tactile, unless you are on teamspeak etc, or find the sound distracting.
Hysteresis. Bad for rapid-fire hits, good for slower precision.
Activation point. Much like hysteresis, what's good for rapid-fire is different to slow precision. Bottoming out to make contact gives zero hysteresis and a form of feedback (the worst kind, but feedback nonetheless.)
Now, having said all that, I'm thinking the ideal gaming switch would activate right at the top of the travel. This could be done by using inverse electrical logic. Contact would normally be made when the key is untouched, and broken when the switch moves down. Logic chips would have to reverse the signal as needed. This would make some of the above choices totally irrelevant.