Hi,
Thanks for your quick reply. Now the weird thing was. I clicked on the ground as you said, and then clicked to the lever - it didn't work (as I already tried that before). But then I tried and did the same thing again, and although my mouse was still showing me the red cross - it worked

May be it was a wee bug?
But still, I think if different classes had their own way of doing things without much exclusions it would have been better - as you could focus on things that you really need for your class.
But thank you!