I may be misremembering, but I can't help but think Blackheifer got a response back from Larian saying that this issue would be fixed in a later patch.
Again, don't quote me on that. I'd have to search all over to find the post in question. Hopefully, he'll come into this thread and let us know if that's the case or if I'm completely misremembering or misunderstanding.
This is correct. Larian confirmed by email that this is a bug/exploit and that it will be fixed in a future update.
Outside of that it's pretty clear in the PHB that you can't go Level 1 Wizard/Level 11 Sorc and scribe all spells through level 6 and then cast them with Sorcerer spell slots. I mean it's complete nonsense.