Been fiddling wit it just now and has an idea.
Endless sequencer has a manual mode, which is very interesting, but hard to control precisely. I think it would be amazing if it was possible to advance it simply by pressing a key. (Currently keys transpose the sequence, but do not advance it until you turn the blue knob.) There would be many, many ways to use this. The most obvious one: pre-programming a sequence, that varying its rhytm in real time.