My workaround for non-diatonic modal interchange is to open multiple Scaler instances which can get quite complicated. Especially when more than two non-diatonic scales are applied within one progression. A possibility to change scales within the diatonic modal interchange window would be great. Especially with the possibility to shift the scales semitones up or down to generate passing chords.
With this feature Ableton´s Push or Novation Launchpads would make a lot of sense for people who don´t play keyboards I think. I thought of getting an 8x8 MIDI controller for Scaler but I am still hesitating until I see where the mapping journey of Scaler goes.