Sounds like a great idea to me, I know this problem. (I do remember where I can edit my scratchpad, but getting to it and viewing the results is more complicated than it should be.)

I would even go one further, and add a 'edit/view my scratchpad' to the links at the top of the page next to 'log XXX out' and the home node link. Which makes it easier to edit my scratchpad, and also quickly view others without needing a link in the CB or going through find user, view scratchpad etc.

C.