SENDS - It would be nice to have a optional skin for the “Sends” section in the Inspector View, Edit Track View & Mixer. Instead of sliders it would be nice to have Knobs.
Again for the Sends section, some kind of GUI for Pre & Post Fader instead of it being hidden in right click menu would be nice.
MIDI Event Editor (Piano Roll) - have temporary position locators that follow mouse selection to help with quicker copy & pasting of desired sections in desired intervals like in Ableton.
MONO Tracks - a pre-setup mono bus routing should come as default so the user has a option in inputs and outputs, even better have a mono button on tracks if possible.
Automation - Curved automation without needing to use the parabola tool
Inserts- Allow more than 8 inserts per track
The rest is stability & GUI polish.