IMO the mixer is already good for live use, one thing that would be awsome for live use is some way to link several sliders to one midi knob:
http://www.renoise.com/board/index.php?sho…c=12611&hl=
or
https://forum.renoise.com/t/new-meta-device-hydra/19684
To make Renoise a capable loop remixer I’d rather see some expanded functionality in the sampler, like midi assignable loop points.
But the main thing to make Renoise more live friendly is better pattern sequence/launch control. I’d like to see something similar to the “clips view” in Ableton:
http://www.renoise.com/board/index.php?sho…743&st=210#
http://www.renoise.com/board/index.php?sho…c=11879&hl=
Edit: Oh yeah, the pattern instrument idea is very interesting too.