quick note: scott w.'s MetaBlogExtender for community server didn't cover quite the full blog post API as stated. so i extended the extender a bit to handle an additonal extended property. had some thoughts on a better approach which would be to simply use reflection and auto-recognize any properties that correspond to whatever textpart tags come through (and ignore those that don't), but i'm not there yet.
the specific reason to even address this (for a customer) was that the ability to link a post's title to another url is hidden and normally only appears for mirrored feeds (and only behind the scenes, at that). another attempt to expose this feature misses the mark, and is more intrusive / less well factored than simply configuring a CSModule.
no, no code here for now. i feel like that would be, uh, over-extending myself ;-) besides, the reflection approach is what you want.