I've recently placed fake plants in most of my scorpion tanks. As I came back later, I found that ALL the crickets in their tanks were perched on the highest point of the plants.

I thought this might be a cricket characteristic... but my Asian Forest prefers small Arizona Bark Scorpions for food (I realize this may be scorpion blasphemy to some of you, but I find them every day living in AZ) and the little Bark was perched on the highest point of a plant as well. Fear? They must know they're in a tank with a humungous arachnid that is going to eat them? Interesting.. I'd probably be doing the same..

Have any of you seen similar behavior?

Yes i did remove the stinger. I suppose you could call it an experiment I tried, but I definately won't be doing it on a regular basis.

No worries
Quite a few people feed their desert hairy scorps bark scorpions as well, but I think that naturally occurs in the wild.