Add an option for guests to pay a "Pet Fee" (this is already a sugggestion) AND tie this in to the new Security Deposit system. For my use case, I don't want to collect a Security Deposit from ALL bookings, but I do want to collect one for all "Pet" bookings. Even if the Pet Fee Collection stays manual, right now, it would be really nice to be able to trigger the Security Deposit collection for only reservations where people are brining pets (or any other reason, I suppose).