Another thing: Some kind of send/return fx group like on the MD would be very helpful for for muting single tracks. For example adding some delay to a track before muting it to make it fade out a bit more smoothly. That's not possible with the track effects because the delay is killed as soon as you mute a track. (Also not quite possible with track 8 as master because you cannot send just a single track to the delay.)
edit: Oh wait, If you could stop single tracks (which will obviously be implemented) it would be possible too. An option for quantizing the start and stop of a track like when changing patterns would be great.
Go elektron go