I have to admit I don't really give much of a damn about the balance of short rest. It's nowhere near as impactful as long rest in the grand scheme of things.
Asking how many times you should be allowed to do one is a bit weird, though, since it really depends on how the game is going to be balanced in the end (how frequent will fights be in a certain area? How threatening? Are we getting proper passage of time or not? Does it matter in any way? Etc.
