Hi,
i have no clue if this is hard to process, but if i could shoot a quick wish, that would be to add some sort of very simple expressions or scripting to the MIDI linking or the app itself. In order to build more capable setups and maybe even small chainreactions. i.e. one key could trigger an event of cycling through channels or one slider could automatically set another slider to an inverse value on change.
No idea if that would work, but the results could be very interesting.
Cheers, a.