I have a suggestion for a feature i.e Adding a flag for migration to Stack Overflow.
We really don't migrate much.
In looking at the stats for the last 2 years, we have migrated 3 to Sound Design, 2 to Software Recommendations, 2 to SU, 1 to Signal Processing, and none to SO.
So I don't think it is a useful migration destination to have in our options list.
Remember you can flag for mod attention, and in the custom text field tell us where you think a post should be moved to.