Two of the TODOs already listed, and 2 more found in review, have been done. With these additions, I felt IDLE was ready for the 3.6.3rc1 and 3.7.0a1 releases last Monday.
#31502 Fix problem with deleting user themes and keysets.
#31480 Disable ZzDummy by default, change tests to match.
#31477 Improve rstrip entry in IDLE doc.
#31488 Make non-key options take affect immediately. (Parenmatch required revision for this to happen for its option in existing windows. The options were previously 'baked in' in the __init__ method.)
The following remaining to be done:
Grey-out code context toggle on non-editor windows.
#31547 Write augmented user keysets back to file.
Call each event_add(pseudoevent, sequence) just once.
Re-evaluate some of options.