Currently the buffer sets both the before and after appointment buffers to be the same.
Although the current method is convenient for some people and appointment types, I have a need to do a 1 hour before buffer and a 15 minute after buffer. The workaround for this is very inconvenient.
You could make before & after the same by having a "link" setting so the user only has to put in the buffer once. Then unlinked, the user enters separate before and after times.
I hope this would be useful to other people, too.