Barony
Idea: using lockpicks to damage gems and scrolls.
In my current run, I have three jetstones, three pieces of amber, and three pairs of scrolls. They're all at different states of wear, meaning they're taking up 12 inventory slots instead of 5.

It would be great if we could chip gems to make them stack, and scratch scrolls to also make them stack. Even if that reduced their value, I'd be OK with plain carrying more things. (Especially since last year's inventory overhaul meant we'd lost inventory slots to equipment slots.)