Its so hard not to spoil them isn't it?! However...Once you condition them by allowing them to call the shots, You can end up with a bigger problem in the long run. This makes your life miserable and heaven forbid you have to take them to the vet or someone else has to watch them for you. Best to stay on a regular routine with special spoiling for special foods . Like you said about apples.
I only put a few crickets in at a time once they are nommed up then a few more etc. Once that gleam of AHA! is out of their eyes they are done. You shouldn't leave them in with our beardies unattended and never over night so whats the point in dumping a lot in there other than its a conveinience to us and well entertaining to see them go WHOA MUNCHIES!! lol,. I saved a parmesan cheese shaker and I keep calcium powder in the bottom, plop in some crickets, shake shake to coat them then I can tilt them out a few at a time. Im allergic to those nasty things and don't want to handle them either.
Sometimes when my little brats don't want to try new food it gets cut thin and in long strips then I dangle it from my fingers making it wiggle and dance like a bug. Eventually I win and they eat it and all is well. Except Bluberries.. That went no where. they cocked their heads like... what the heck is that and why is it in my dish. Not even rolling them or dicing them up made them want to eat them. Mango on the other hand was a magical euphoric drug to them both. I almost lost a finger on that! hahaha. either way I won!