rMail yourself?
I'm not at all opposed to this concept, however, I would offer some counterpoint:
The Scratchpad in any game is only 10,000 characters in size. That might not be enough room for extensive notes. From this the desire to rMail oneself arises. I can see that well enough.
I tend to keep notes about a game (especially those things the players should not yet know) offline. That said, I get that, as a GM, being able to send rMail to oneself might be convenient. Players might also gain benefit from rmailing themselves, I don't know.
The closest one might come to this is to clear out an old rMail topic and re-use it for this purpose. I wonder if one could mail notes to an NPC in a game? Hang on a tick... Hmm... can't rMail to one's own NPCs, so, yeah, re-using an old rMail topic might be as close as one could currently get.
One can also create a topic in one's game for notes, put it in Group Z (I think) and don't put anyone in Group Z that shouldn't see your notes.
The only concern I might raise would be if self-rMail were to result in a large rise in bandwidth or something like that.