CheesyBlanker just blacks out the screen after so many seconds, which you specify by running it on the command line. You can just run it with no arguments, or double-click it in the Tracker, for a default blanking of 5 minutes.
CheesyBlanker is basically as it's name implies; It's not very smart. All it does is open a big black window over the screen. If someone or something happens to open a window after CheesyBlanker kicks in, well, such is life -- you'll see it! But it aught be good enough for most people, and hey, you got what you paid for, right?
The only way to quit CheesyBlanker is to kill the process from the shell, Vulcan Death Grip it, etc. Or, if you can use Attila Mezei's "hey" program or otherwise send a B_QUIT_REQUESTED message to the app, it aught go away.
v1.01 fixes a bug that would cause CheesyBlanker to whisk you away to whatever workspace you happened to be in when you started the app, when the screen blanker engages. It should now leave you in whatever workspace you happen to be in when the blanker kicks in.