It would be nice to be able to expand your deed register. I think a good way would be with potency crystals: allow up to 100 items in a register max, and a number of slots per application, like 5 or 10, depending on what seems most balanced.

I'd love for expanded register slots, but it's worth pointing out that [mechanically] the registers themselves don't store the items, so it might be weird to have crystals used on a specific register expand your slots.

AFAIK, registers are like vault books, only you can directly pull items out of it.

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Uzmam! The Chairman will NOT be pleased to know you're trying to build outside of approved zones. I'd hate for you to be charged the taxes needed to have this place re-zoned. Head for the manor if you're feeling creative.