1. "User Manager" help screen at Help site, you must retype the key reference to "screen.users" (now the key reference is "screen.users.edit").
2. "User Manager [ User : Edit ]" help screen at Help site, you must retype the key reference to "screen.users.edit" (now the key reference is "screen.users.edit2").
Remains an issue and with some weird behaviour. As said before this may not be resolved at this time and will not ultimately be allowed to stop release of the help pack.3. "Menu Manager [ mainmenu ]" help screen. We have mentioned it above (the help button links to "Menu Item: Link - Content Item"). You said the key reference (screen.menus) is placed into the correct Help Screen. Perhaps it can be duplicated (see "Menu Item: Link - Content Item" at Help Site).
4. "Site Mambots: New / Edit" help screen. This could be a similar issue (the help button links to "Site Mambot: MOS Image"). If the key reference (screen.mambots.edit) is placed into the correct Help Screen, you can check if it is duplicated (see "Site Mambot: MOS Image" at Help Site).
Note: Solution you have adopted for "Template Manager [Site]" Help Screen (the strategy redirecting to the correct screen) could be applied to another cases (see the review for issues highlighted in orange color) => Perhaps you are already doing it
Seeing as it seems quite an effective way of dealing with the issue - I thought I might abandon the idea!