RE: Is it possible to bind StickyArea to Entities?
You could try doing something similar to how the power cable somewhere in Penumbra Overture works. I have not played through all of the Penumbras, so idk if it occurs more than that time, but it does there, about 2-3 hours in I would guess. However, the cable itself WAS rather glitchy, but not as much as some other entities I've seen that try to do something similar. Making a cable seems to be extremely unstable in HPL.
Here's a video of the Penumbra one. Personally I never had as much trouble with it as this here, but well, I did have some oddities with it. This is probably why you don't find these entities anywhere in Amnesia.