I dont worry much about leaving crick nymphs in the cage overnight, but never the full grown cricks, and esp the black field crick (you can really feel their bite).
Only Smeagol and Noogie get adult cricks and dubia roaches because they are big enough to handle them. I cup feed only with those.
If they can "chirp", they are mature enough to bite!! they get cup, or hand fed. When holding them, I can feel biting, so imagine how it would feel for a little cham