I'm finding problems with remote administration on the RouteFinder. It will not allow me to connect to the default admin port (80) over the VPN even though I have added a packet filter rule of MyLAN-Any-Any-Accept.

You need to add the remote LAN subnet into the webadmin Administration allowed network in order for you to remote webadmin from the remote VPN subnet. By default webadmin only allows for the local LAN subnet only.