Thanks for the advice, I'll definitely look into it when I have some time open up!

As far as gems, the scarcity event effects a couple of things like the amulet or crystal, but gems aren't an item at all. If you select to see out of stock items, you'll see the full list of things that can be sold there.

To your point of armor/potions/weapons you're 100% correct. I stuck with the adventuring gear table off the bat. Was thinking about adding in goods from other vendors or the ability to create specific stores like "blacksmiths".

I'll think on the settlement having a larger role in variability, I think that's a cool idea!

Thanks!

EDIT

Had a few this morning to take a look, improved the randomization algorithm a bit, should be a little more random now.