If you used the unlocker - then no you can't get S-OFF. but the only thing you really can't do is flash radios or boot splashes. Not a real problem at this point. I doubt we'll see another official radio update. Enjoy your root and welcome to the dark side!
Go to that forum thread and near the bottom Scotty85 gives an explination of how to get clockwork recovery through fastboot. It worked for me as I was having the same problems. Hope this helps.
And thanks to @PvilleComp "The Stig" for bringing this to our attention (I know I'm a year late but better late then never...