Title says it all, would be great to have microtonal scales. There are a bunch of VST synths, such as the Madrona Labs stuff, that can do it and a handful of hardware, most recently the Korg Monologue allows for microtonal scales. It would be a pretty unique functionality.
I imagine it would be predominantly limited to the internal synth and possibly re-pitching the samples. Though it would be pretty crazy if it worked with the CV output. Not really compatible with MIDI in general, so don't worry about that.
The way I envision it working is that you would have a folder in the root directory of the SD card named something like "CustomScales" and that's where you would place your scala files. Then after you tap through the 7 western scales built into the Deluge it would scan the folder and display the custom scales. Then in the keyboard mode or in the sequencer the octaves would be spaced depending on how many tones are in the scale. So, in a 5 tone scale the octaves would be every 5 notes/keys, etc.