Running VC titles from the SD card through the system menu has nothing to do with BBLoader.
Yes, you can install it over PortablizeMii simply by running it and following the installation steps. Make sure to set "Yes" to both options in the installer.
There is no tilt support yet, but I will work on it.
Hiidra works in a different way compared to other loaders, so selecting IOSes isn't really possible.
Cheats are planned, but not important for now
I have actually had a similar issue with other two SanDisk drives. I am still trying to fix it, somehow the FAT library used in Hiidra doesn't like SanDisk drives.