

That is interesting. You can do that by the command line. Basically run cryptsetup to map the encrypted partition, then run mount. Those commands could also be place in a bash script too. You may need sudo access to run cryptsetup. You will need sudo access for mount unless you configure it as user mountable and not auto mounted in fstab.
You also want script to umount it and unmap it with cryptsetup when done.
Graphically, maybe the Disks gnome tool can do.

What is all this for criminals BS. Graphene is one of the best ROMs out there if your willing to use Google hardware. Pretty much just works and without the normal bloat.