[1] Time-stretch
16 steps for the drum parts is a sensible minimum, but really limits the synth part. I would like to run the synth part at half or quater speed of the drum part. In general there could be sort of playback control for half/double/etc., independent for synth and drums.
[2] Transposition
It can be simulated using square wave LFO (rate at minimum), but this is just a dirty workaround.
[3] Active step reverse
You can use active step to make two sequences (verse/chorus), but switching between them can be tricky. Double-clicking active-step button could be used for switching between active and inactive steps.
[4] Random LFO alternatives
I don't like when something is wasted and this is the case with wave select switch in sample&hold mode. Personally I would love a hard/soft-synced osc or sub-osc (the lfo can go into audio range!). If this is not possible then tremolo, raising saw, or a different random generator. Anything seems better then no choice.
[5] Playback scrambler
Reverse and shuffle/de-shuffle for the synth part.
[6] Arpeggiator
Octave up/down or any other interval in fact can be simulated by the square wave lfo, but this takes the lfo away.
[7] Off-beat drums
When triggered simultaneously the drums mask themselves. Optionally they could be triggered slightly off the beat to prevent this.
I am posting this here in a hope that Korg not only hosts this forum, but it reads it as well.
Best regards,
Michał