It would be impossible to trigger the synth with MIDI and audio simultaneously. It’s a monophonic synth so that would be confusing.
Switching between modes was faster on pre-v4 units as it would simply switch to whichever input type was detected. Now MIDI- and audio-triggered parts are in separate parts of the memory. We do have relatively fast switching of the apps so perhaps this functionality could be re-introduced, or at least via a MIDI command.