Action Bar Hold-Switch

[Urist]

Hello. I've searched around a bit but can't find anything about this topic. I was told to ask here if it was possible.

By default, the bind for action bar swap is: push button = swap weapons, push button = swap weapons.

I'd like if I was able to make it: Hold button = swap weapons, release button = swap back.

I'd like to be able to bind swap to alt, so instead of doing things like 1234(swap bind)1234, I could do something like 1234, alt+1234. Hopefully I have explained well enough.