I noticed this too on my shield. I was going to put some ISOs on my SD card for FPSE to use. When I was in FPSE's config, I was going to try and point it to the SD card but it would only allow me to work with the onboard memory. Would the SD card fix allow me to get this working? I really don't want to store ISOs on the onboard memory or just continually shuffle my active ISO to the internal memory when I want to play that game.
Yes SDFix: KitKat Writable MicroSD will allow you to move things to the SD card. (write access) Just remember you need to be rooted to use the app.