You could do it using the microtiming setting on a note to shift it into the 32nd or 64th sub division. You’d still only have 16 steps to play with (per page), but you could move them around into those smaller divisions you want.
Alternatively you could probably do something funky with the arpeggiator, that can go very fast on the higher speed settings. That might be tricky to program exactly what you want though.