add-on gives users the same login privileges as any other user on the forum (provided they are not in the whitelist) .
Permission control - select who can log in as other users
Whitelist - identifies users who cannot be logged in by others
Make the user provide reason when logged in as another user
Send a conversation when logged in to another user
Do not make your IP login with the logged in user
Alerts, chats, threads are not marked as read.
All login information is recorded in the log of the moderator