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For modded weapons, they'd have to be added into these lists as well. As such, they would have to be supported for each individual mod.
If you want the letters to show up, you'll have to turn on the Letters on Buttons option.
Do you have a GitHub?
From what I see in the code, the item names would need to be put into a list to be checked. If they aren't in the list, then they will not be included in the item selection.
If you have a bug report you wish to give, then add them to the discussion board and I'll take a look at it when I can.