It has been mentioned here before but hoping this feature could be made possible.
Having the FX Bus Sends available in the routing tab (so it can be patched to any analog, digital or card I/O) would be amazing.
That way you can use external hardware or something like Live Professor or mainstage with FX (reverbs, delays, chorus, wideners, etc.) and have the return come back via an input channel.
That way you free up the RackFX that could be used as inserts (and have an extra 4 bands of EQ via the FX return channels).
Something else that I think could be fun is having the ability to have FX Sends 1-4 sent to more then one RackFX. Sometimes you want 2 different reverbs (or 2 delays) but are OK with those having the same “source”. balancing could still be done via the FX Return channels.