My top-5 features would be based on improving things mostly:
1. Implement common industry standard regarding controlling daw from midi controllers or other surfaces. Right now it is very poor, so to speak.
It is also would be nice to be able to make midi-learn for buttons, knobs and sliders - just like in vsts, but for whole daw.
2. Add midi send to midi tracks. This would simplify layering. So I can have one midi track and easily send it to many synths/instrument tracks
3. Improve support for high dpi. Right now it is pain in the ass to draw automation lines on 4k display, for instance.
4. Step sequencer must become a complete tool that arpeggiator, automation (!) and pattern creation capabilities (suggestions mentions above in this thread are appreciated). Together with item 2 this would make the daw fantastic for electronic music production.
5. In console view a section with level meter must be made resizable. It should be possible to have very long and precise meter and volume slider (makes a loooot of sense on big displays).