Single Click to Sit

I have seen this done in a Sin Labs' object, you click a certain prim and automatically sit on it without right clicking. Not only that, but permission isn't even asked, it just happens.

I figured that would be amazing in an elevator script, however my attempts to make it have failed miserably and more often then not just doesn't do anything.

Anyone have a few words of wisdom to help me out with this?

Edit window - General tab

Look at the bottom 'When Left-Clicked'

Change it to 'Sit on object'

Gah! I saw that before, but I never thought to use it! I'm so dumb.