Ability to enter in grace note pitches via keyboard/MIDI keyboard

I'm putting here because it seems such an obvious thing to want to do that I'm suspecting I'm just missing something - but I have lots of runs of grace notes in the music I'm currently working on, and I can't figure out how to enter them using the MIDI keyboard (or even regular keyboard) at all - only by painfully adding one by one then using cursor keys to shift their pitches.
What I assumed is that you could switch into "grace input note" mode where newly played/entered pitches would get added to your current run of grace notes.
Failing that, if I could take a run of standard notes and convert them to a run of grace notes that would be OK too.
If such a feature already exists, great, though the manual doesn't seem to explain it.