The problem I see with this is that if you start heating a rig up to the point where cable droop/lx tape failing is a problem, then the cables are quickly going to be the least of your concerns. We would then need to look at how the rest of our kit holds up to being heated up like that- I can't imagine hemp bars would take it well! Neither would slings or strops, and you would have to look at how large, plastic cased items (projectors, moving heads ect) would respond, along with pretty much every other component of a rig. It does make a lot of sense to have cables well supported over fire exits- the easiest way to achieve that is for venues to install cable tray over each exit, which would have the added bonus of making our lives much easier when running cable. Because its easier than the alternative it also means it will get used, rather than some rule (everyone must use stainless steel cable ties ect ect) that isn't enforced and is therefore widely ignored. I think what is actually needed is better fire fighting plans for a theatre/stage environment. I certainly wouldn't want to have to go into a theatre that was on fire, because there comes a point when things are going to start falling out of the sky. At first it may be the cables, but eventually bars, drapes, lights, set ect are going to start falling, and as the person on the ground in a smoke filled room its probably impossible to tell when that exact moment will be. The ideal is to avoid putting anyone in that situation of having to go into that environment.