Hey Matthew,
Thanks for reaching out to us!
Unfortunately this is something that has yet to be addressed. At the root of the issue, it appears to be an issue with the way Thesis handles page templates and the fact that they aren’t handled in a traditional, “WordPress” way.
As our developers have looked at the issue over time, a “solution” would be possible but not something that has been completely addressed or worked out. Additionally, as time has gone on, the demand for this has greatly decreased so this has unfortunately been pushed to the back burner again.
I apologize for the inconvenience that this has caused.
Thanks!