Ok, that for exclusive functionality was quick thought...and about code architecture you are probably write too.U can better judge, u are developing that :)
My thought came from chat with friend of mine who works for Unicef here in Slovenia. Since she is web admin I asked here to took a look and comment her feeling on SS CMS. The notice was, that she would rather have 2 separated modules for different things (blog and news in our example). Rather than 2 different page types to choose from when creating new page.
Witch leads us to Ingos hack in Typo3 I think. I hope you know what I want to say :)
Or maybe you already thought doing something like that ;)