We would vote for the ability to do exports/imports in the background thread too. Fetching data via Rest API does not seem to disconnect logged users, so it may be could be possible to do the same with exports/imports.
I would like to know what BackgroundHALShouldPause does, and how to use it. While it's listed in the HAL Primitives report, it is not used in source code and it doesn't appear in the LMS HAL...