Themeframe for WPMU

Flynn, as I struggle setting up a Wordpress Multi-user site, getting the right kinds of themes in place to give my users a good experience, I'm thinking: "Wouldn't it be cool if I could supply Themeframe, and only Themeframe, to my users? They could essentially create any kind of theme they want using its building blocks."

Do you see any issues using it that way? I'm supposing most of my users will have zero Wordpress experience, and very little technical knowledge or desire to learn more. They'll just want a theme that does what they, individually, need.

I'm finding very few themes, for instance, that allow the user to upload a new header image. WPMU users don't have FTP access, so it has to be a browser upload. Could you build that into Themeframe? I would be happy to test this in this MU environment.

Another question: are you building Themeframe with WP 2.9 in mind?