Ah, yes, that makes sense. I guess it WAS very easy. :)
But!
When i add my own global variable and enter int(random(2)) in the value textbox, Construct 2 crashes when click the Done button:
<img src="http://www.themightyatom.nl/screenshots/C2CheckFailure.jpg" border="0" />
It does this every time a try it again. What now? :(