i have no objections to mounting opt_cram.fs files on /opt, it's just it would be good if /opt was writable after
it should be easy to mount /opt using unionfs so files are written to say, /root/.opt ... then it would be writeable (and changes made to /opt would be saved between boots)
the way it is now, /opt is writeable, but changes are lost (my programs make new symlinks to /opt every time the programs runs, if they are needed)