Now I know this form is old, but I couldn't find anything else to fit.
If your looking for a compelling case (to the creator of scirra) I have one.
I am re-creating a limbo-type level, and the terrain is compiled in a single image (1920*8000pi). This was the best method to design limbo terrain after much research. Originally attempting 2D in Blender3D BGE it just didn't work out so I turned to my long-time used engine of Construct 2. I looked for an option for HD Collisions but I couldn't find it, so I looked up and I found this.
Sure, I understand performance issues, but with High Resolution terrain that your only rendering a certain portion at a time, this sort of thing is NEEDED. It would take me a very long time to do each point by hand, and especially since that covers an entire level. So correct collisions are needed, and in the past your engine has done them better than me.
I just ask that maybe there be an option for "HD Collisions" with a Warning so users know what they're getting into.