DDMsgReader - add key to change user level to preset number

When I get a new user, one of the first things I do when they email is increase their level from 50 to 60. This isn't difficult, I press U, enter the password, M for security level, and 60 enter then quick back to the message.

It'd be nice to have a single keypress from the read message that will just change their security level to a given value in the .cfg file. Maybe J to jump levels or I to increase level. A single keypress would be a nice addition and shouldn't take much to add.