Really impressed by the amount of effort and thought you're putting into this, it definitely looks like it'll be a must-have mod, much like your previous work.
As far as the manual reload feature goes, it's now a part of the vanilla game. Not sure when they added it, might've been in the survival update, but it's definitely there. It also works seamlessly with weapons added by mods.
On a side-note, do you accept donations?