Hi Mark,
Anything that adds gamification to Moodle is a great idea and will be immensely popular. I use the Progress Bar and it has a dramatic effect on student performance and supports a "flipped classroom" approach. Badges are another important gamification tool. I would imagine Kahoot.it with students competing against each other would be very fun, and increase participation in learning activities. I would recommend you work with some programmers to make a new block or module to integrate Kahoot.it with the Quiz Module. Is that something you could do? You could also go to the Tracker and make a feature request, but I suspect it needs independent initiative to get going.