Unquantized recording/note offset
Sometimes you really want to capture the groove and feel of a beat or a synth line. It would be great to have the Deluge (optionally) record unquantized notes. I also believe this would help the Deluge be recognized as a professional piece of kit, and much more of a contender with DAW sequencing or hardware sequencers like the MPCs or Pyramid.
This could possibly be implemented fairly easily by recording exactly the same way as now, but give each note an offset percentage (which would appear in the display) from the current grid resolution. This way, editing notes would be the same, you'd just be able to edit an additional parameter.
It would also be fairly easy to do a post-record quantize by setting all the offsets to zero, or even partial quantization (tightening up a bit) by reducing the offset by some percentage. If it was done more as a filter than an update, the quantize could even be non-destructive.