SysEx support works
Recording and Playback of SysExes works now. That doesn’t mean,
you can dump your sequencer settings or sounds into Ardour, but
playback related messages such as effect settings, GM2 or the likes should work.
There is no GUI whatsoever yet, that may come in the future.
(Probably little yellow flags, like the Program changes).
Later I plan to add a SysEx gui generator, which reads an XML definition of the SysExes.