There isn't currently a HotKey for this, but we do have an open feature request. I've added your vote.

Thanks!

We've just released DisplayFusion 5.1 Beta 11 (http://www.displayfusion.com/Download/Beta/), and there are now a bunch of Mouse Cursor related Functions on the Settings > Functions tab. Just assign a key combination to the ones you want to use, and you're good to go.

Thanks!