Adding written instructions to guide the people that don't read written instructions won't work. So, here's a suggestion for changing the "Requires editing" button's functionality I have been considering posting for a while:
When the reviewer clicks "Requires editing", bring up a dialog similar to the flag/unsalvageable dialog box. Provide two options (plus a cancel-button for fat-fingered individuals like yours truly):
- The original poster should add details -> Flag as "Needs details or clarity"
- Requires editing for language, spelling or formatting -> Move to H&I
I used the Developer Console to make a mock-up of this dialog: