A trick you can use at feeding time for all live insects is to put hem in the fridge for a few minutes. This slows them down enough you can easily get them out of their containers and into your pet enclosures. they warm up and start moving again just as you get the pet enclosure closed up.
As a kid I did a now legendary "experiment" with fruit flies. Thanks to the inexperience of youth, my parent's house was infested with hundreds of thousands of flying fruit flies for close to a year!
This is why I prefer the wingless strains of fruit flies for feeding. Some strains of flightless fruit flies WILL redevelop the ability to fly after a few generations.