It would be nice for pattern editing to get some long-waited attention:
Editing octave number column separately from the note itself (faster than keyboard shortcuts or “advanced edit” plus more fun because tracking instead of mousing around)
Fine-grained selection (only selecting the columns/fields one explicitly selects instead of using “advanced edit” to cull the selection afterwards - good for quickly copy-pasting wanted column data only)
Uncentered pattern view (view scrolls only when cursor moves beyound visible area - good for overview)
4. Jump into next similar pattern data. A button next to edit step to enable jumping into next similar data point in a column after input. If it was a note under cursor, jump into next note. If it was note-off, jump into next note-off. If it was pitch slide down, jump into next pitch slide down. If it was value 0x80, jump into next 0x80 (value jump may not be that useful though). And so forth.