Can I use this SSD caching on a USB Flash drive?

Can I also use an USB stick to install this software? E.g. USB 3.0 should be pretty fast? That way I don’t have to open my laptop and I still enjoy the speed benefits?

If it doesn’t work, is this something to be planned in the future? Or is this just not possible because USB flash drives and SSD drives work differently?

caching a boot volume is currently not allowed via removable storage. Sorry.
This is of course something interesting but has to be researched yet.

Caching secondary volume works.