Oh they can run plenty fast from predators, by the time they get flight, whatever is chasing them probably got to them, the flight saves the rest of them maybe..... ie I don't have to be faster than the bear.... just faster than YOU ! type thing.
Clipping wings, even with wings clipped, they put enough effort into it, they can still take off, unless you take pretty much ALL the flight feathers off. I have a video of a jack in the box rigged with a little DC motor on the crank pin, a fruit snack on top of the box... and the cockatoo who made that magic happen to prove that clipped wings do NOT stop flight

. he got even with me though...yes I deserved to have that shoe chewed up im sure
Anyways, if you do part time free range, I did this often when working odd shifts, wait until about an hour before sunset or however long YOU have to be free to babysit them. Depends on the birds but I had one that would wait until the very last absolute fraction of a second of sunlight, to finally go in to roost.
DO count on them getting into stuff you do NOT want them to as well if you are not out there watching them while they roam around. You know what, here's an idea, you want to get them into the cage as quickly as possible? Great. all you need to do is point to the cage and say NO... BAD BIRD.. turn around and they'll be in there in about 10 seconds later

Aaron