well, what Guyot was asking for is already possible, isnĀ“t it?
-> enter “INST SELECT” mode, hit “TAP WRITE” / Page > and play notes on an external midi keyboard connected to MIDI IN with the sequencer running.
this will record only midi notes, not note length though (which was Luke was asking/hoping for)…
I think chords cannot be done the way they are implemented, since they use fixed intervals based on the root note put into the sequencer (which is kind of nice since it means it is none-destructive and you can change chords or root notes easily without re-recording!).