For now I'm planning on having language in our district policy that allows individual libraries to set limits on the number of items patrons may borrow as needed to preserve fair access.  Some of our items and kits work well together, and I don't want to create barriers where they aren't necessary.  Every library will be different, of course. We currently aren't facing a high demand for our items, if that changes in the future we may set a limit. I typically see other libraries set it around 3 to 5 at a time.

Our district has patrons renew their borrowing privilege annually, I think it's reasonable for us to have patrons review and sign the lending agreements/waiver when they update their regular borrowing privilege.

I admit I'm new to this library stuff so I don't know the lingo but for late items our goal is getting the item back, not raising funds through fines.  So my plan is to have late fees incurred as soon as the item is late and notify the patron, but waive those fees once the item is returned complete and in working order. If not it will eventually go to collections as we do with books. Also some of our libraries only have one staff member, so our policy will be to not accept items that are not clean. It is the patron's responsibility to clean the item and it will be considered late until returned clean, at which point the fee will be waived.