Regarding the action-out-of-prompts - on occassion I find myself destroying things I don't mean to destroy and such. This could be trees or corn - I definitely think the immediate feedback is great, but perhaps for melee actions, it the animation doesn't actually cause things to be destroyed, moved, etc.
I haven't played multiplayer yet, but does the number of enemies or drop from trees/plants scale with players?
I'll keep an eye out for potential laptop keybinds.
Also, as of the last update, saving and moving to a new zone both work!