The 1.15 update did fix a major crash to do with weapon remapping that caused remapped weapons to not show up in battle. That was bad.
Anyways. I just wanted to let you know that being able to map different weapons is going to be coming out in the 1.16 update. Its gonna take a little time to do this though, since i need to completely uproot the old system and put in a new and better one that can handle this type of stuff. I'm doing it right this time, so not only will you be able to fire with 1-9, but the entire keyboard as well(just the letters). You can choose to use the entire keyboard(1 for each weapon, someone pls try that), but i don't think you will need it. I just did it because I could and it wouldn't take any more extra time.
I guess you have something to look forward to. Btw, the way I do these major content updates is primarily by demand. Saves were top on the list, then settings(for some reason). But you can rejoice because the weapon grouping is right up next.
Thanks for bearing with me during the development of this game. Glad you seem to be enjoying it!