I'd like to automatically add a charge for early/late checkins/checkouts. I understand where to modify the checkin/out time, I can also see that I can create a trigger based on modifying the checkin/out time -- but that only can send an email template as far as I understand it. Is there a way for it to add one or more surcharges automatically?
Unfortunately, at present there is not, but this is planned for the future.
Should I turn this into an FR or is it already captured?
Ken was partially correct, we have similar stuff planned, but nothing that quite tackles what you're looking for. I'd recommend turning this into a FR at this time.
I just went ahead and turned this thread into a Feature Request so it can be voted up, starting with you. :-)