I mentioned about the possibility of adding Cinnamon version for Slackware Live edition and now the ISO has been generated by Eric Hameleers last night. It consist of latest cinnamon 2.8.x packages taken from my CSB repository (development tree).
Besides adding cinnamon version, Eric also fixed the login loop issue along with adding an option to set the default runlevel during the ISO creation. This should give you plenty of options when you want to make your own custom ISO in the future.
I'm going to test the cinnamon version later today. I just tested the MATE version and it's working very nice indeed.
As always, please download the latest ISO here: http://taper.alienbase.nl/mirrors/slackware-live/