Mythgen development start (mostly) is still about 6 months away (rough guess, based on previous post-release bug-fixing periods) so there's a good chance not everything has been considered in such concrete terms yet.
I'm aware of this, but Toady seems to have put a good of deal of forethought into mythgen; enough that he's willing to give talks on it. As such, I figured it was worth a shot.
Posting a Suggestion in the suggestions forum would guarantee that Toady will actually see, note down and consider your proposal.
Posting here, unless the idea really has been considered in detail, will most likely result in the response 'yes, maybe, no schedule' and then the idea will be buried.
That's not the impression I've gotten about the Suggestions forum. I've never seen any indication that Toady pays it much heed. It seems rather vestigial at this point. Still, I'd be more than happy to be proved wrong on this, and there's nothing stopping me from spending a few minutes making a post there, but I'm content to wait a few weeks before doing so.