This is a very low-priority request, but I would like if it could be implemented.
I like to have the least extraneous elements onscreen, while composing. It they are unnecessary, I would prefer them not to be there.
So, I would like if it would be possible to hide the left and right arrows in the note bars in the pianoroll. How these bars work is obvious for anybody having used this type of notation before. So, I would prefer to only see durations, and nothing more.
(And since I’m here — I reiterate that also great would be to see the Velocity symbols not as an old hi-fi EQ bargraph, but as a simpler notation, like in the CC lane: a dot showing the start, a segment showing the duration; nobody covering anybody else.)