Okay, I'm currently creating a crane that can move crates (quite funny, you know!). I have almost everything working, but the main issue is the rope. I need it to change it's length when the corresponding keyframe_rope is moved up and down (thanks to func_tracktrain, i managed that quite easily =)). However, even with the box "Auto Resize" checked, it won't get shorter, but remain dangling up there like a sausage froma dog's mouth :P.
Also, I'll post the complete map in "Example maps" perhaps - i simply love the way I implemented parent and tracktrain system in tha level! Although the controls are a bit stiff...