Finally Ableton has good midi editing capabilities thanks to MZ MIDI Edit! Do things like split notes, join notes, de-quantize, strum and more! Most parameters are key mappable as well.
Video demo: https://youtu.be/8og-Rx8Uimo
Some things to note:
- Ableton 11.0 and higher only
- Only works on arrangement clips (not session clips)
- Doesn't work when multiple clips are selected