@dphirschler-
Kual is probably not working because the MKK is not installed completely...this use to be a separate thing to install, but it has been incorporated into the JB for the last several versions...if you installed the latest JB (v1.14N) it should be there but you probably need to do a restart via Menu>Settings>Restart to get it to take. I would also recommend downloading and using the hacks through NiLuJe's Snapshots thread as these are the most current. Finally, be sure you add the
latest version of BackDoorLock hack via Kual to be extra careful to avoid OTA sneak updates.
* Concerning the MRInstaller, if/when you upgrade your FW to >= 5.6.1, you can no longer install any unofficial (non-Amazon) packages from Mobile Read the usually way (by placing in root and updating). You will need to place the packages into the MRpackages folder and update via KUAL (you can thank NiLuJe for being sneaky!)
** Concerning the rest of your questions, I can't help as I don't use those things...