Add Separate Keybind for "Cast"

I've seen a few other kinda-sorta similar posts, but none as straightforard as the title of this one.

Currently, "reload" and "cast" share the same keybind (default R). This makes enchanting ranged weapons like rifles to also use enchantments (at least for me). I haven't even tried to enchant my rifle for fear of the presumed mechanic - press-hold R (default) to change ammo type (no issue with that), press-hold R to change from ammo to spell, press R (default) to cast spell, press-hold R (default) to go back to ammo, press R (default) to reload (rinse-repeat ad nauseam).

Having a separate keybind for "cast" would greatly simplify being able to use enchantments on rifles (and similar). Might take a little bit of re-learning for non-ranged items, but IMO it would be a better over all experience.