The new annex.stalldetection is used for transfers from remotes, but not
import and export from remotes.

This should be doable, but it will need the transferkeys protocol to be
extended to cover the additional actions. --[[Joey]] 

> Note that, the protocol is designed so new requests can be added.
> The old transferkeys will exit with an error if the new git-annex
> happens to run it somehow. So it should be fine to add this stuff later
> on. --[[Joey]]
