I tried searching around and didn’t find a feature request quite like this. Apologies if I missed it somewhere.
Anyway, in addition to the existing sharing permission levels -
reader, I’d like to propose adding a
commenter permission which only allows collaborators to add notes to existing tasks in a list. This would really help out for situations where I want to get feedback from collaborators, but do not want to allow them to edit any of my original tasks or notes.