I was doing some more thinking on the ctcss topic recently.  In addition to my previous request of having the repeater tail/courtesy tone transmitted using the same ctcss that it was originally received on, would it also be possible to allow only certain ctcss tones to broadcast over the linked nodes?  Whereas other ctcss tones in usbradio.conf would only key the local repeater?

For example:

151.4 Only keys local repeater

71.9 Keys local repeater and linked node repeaters