RedQuits (or alternative) on Mac OS X 10.10
I just had this same accessibility issue using RedQuits 2.0 and was able to get it working with Yosemite (10.10).  Just follow the steps below. 


Download RedQuits v2.0 RedQuits Download Link
Double click the downloaded package. (You will most likely get a warning telling you the software was not downloaded from the mac store)
Click the apple icon in the top left of your screen and navigate to [System Preferences] [Security and Privacy] [Privacy]
Click Accessibility menu item on the left panel.
Click the lock in the bottom left corner to make changes, then click the ReQuits checkbox in the right pane.
Launch the RedQuits app again, and check all three checkboxes when prompted.
Launch the terminal app (You can find this by searching for 'terminal' with the spotlight search in the upper right of your screen.
Paste the following code into the terminal and hit [Enter]

sudo sqlite3 /Library/Application\ Support/com.apple.TCC/TCC.db 'delete from access where client like "%RedQuits%"'
Restart your computer.
Once again navigate to [System Preferences] [Security and Privacy] [Privacy]
Click Accessibility, click the lock to make changes, check RedQuits.
It should now be working.  If not try restarting your computer once more.