Anything on the website other than the 1 page "doc" for managing engine
services?

I am assuming the loopback driver is like other drivers in that I setup
filters, etc. on subscriber and publisher, etc.

For example, I want to modify password expiration time, so I'll put a
filter on the sub ( from eDir to loopback) of class user, choose the
necessary attributes, etc.

And do the same for the publisher (from loopback to eDir)