i think you may be running the 'old' version of SlidetoUnlock.
development has been stopped on that, and you should use S2U2. (slidetounlock2)..
it has a custom 'setup screen' that arranges all your options, instead of manual registry edits like the original one.
do yourself a favor and install the new version.
i ran with the old one for a while and was very frustrated with some of the bugs.. since i found S2U2, no problems whatsoever. it's great..
http://forum.xda-developers.com/showthread.php?t=353008