The somewhat recently added "overrideCost" and "modifyCost" are great for letting us fine-tune game play, but am having a few issues (or requesting expanded ability).

"overrideCost" doesn't appear to do anything for items in obects.data. In this case, the attempt was to make new tiles prohibitively expensive, in order to limit Aquarium expansion. but there could be other reasons to modify cost for, say, partitions, stairs, platforms, etc.

Also, using "overrideCost" on paints will change the displayed cost in the menu but doesn't actually cost anything to use.

"overrideCost" worked on doors fine.

I thought it might work OK on staff (despite being calculated off of their capabilities, I believe), but "modifyCost" didn't.