What is this sorcery??
I have the toaster and have updated to 7.0.5. I tried to see if the toaster had the slave mode and I think it does. I set the clock to internal on my interface making it the master and the Toaster the slave and then set the project in Reaper to 48khz. The toaster is still showing 44.1khz in the output menu and I didn't touch any of the settings at all. The toaster had synced to the interface and I could record perfectly on a 48khz project. I don't know if this is a fluke but I thought I would mention it.
I really hope this isn't a bug.
This made my day! Thanks for experimenting and sharing!