Yeah - saw that video too - just didn't know if anything in cPanel would go screwy given that it was a cpanel install file that was used.
I also found things like
to get rid of directories with ruby in the name of the directory
sudo find -path /usr/local/ -print0 -type d -lname *ruby* | xargs -0 rm -f
But again - haven't tried either of those YET as I wasn't sure how cPanel would react. I've got a test machine that I'm setting up here tonight to install and try remove rails from it to see what happens though.
Good lookin out on that video though!