+1 on this. I use TONS of checklists and a partial ādoneā would be very useful. Ideally the ability to toggle a few different ācheckmarkā types. I like to track progress on a long list (on my old text file/print versions) by using X for a āall doneā equivalent to a check mark, then - \ and / to indicate progress and status: - for āstartedā, \ for around 1/4 done, \ for 1/2 to 3/4 done. Even better would be the ability to set a range say 1-5 in place of they symbols.
I typically have so many projects going and a quick peek shows rough status.
My current work around is a prefix for each top level todo/checklist - [-----] with the number of hyphens indicating progress (more hyphens = more stuff todo!).