I like your first sentence but I think that would get kinda annoying, especially when I have the AS50 and am zooming. It would be cool occasionally but if overused would get annoying, like click-push.
The AS50 Doesn't have a zoom. oh and /support
I press 'F'.
There can be a distance limit and maybe the player doesn't take the gun right off the bat. For example, someone tries to take your gun and a message pops up saying "Someone is trying to steal your gun, they take it in <countdown>" and you can kill them or run away. The countdown could also maybe have the time limit adjustable in RTB so it can be instant take away or you have a chance to keep it.
/support