The reason I wanted to dicuss this was I met a really nice horse a couple weeks ago. He was a TWH/Arab cross. They used him for trails. He had five gaits: walk, trot, canter, rack, and flat walk. He had a lovely TWH temperment, suprisingly nice comformation, and was pretty athletic.
What were the odds of that cross turning out so well? Because I'm sure it would be a "thing" if everything always worked out so well... But as far as I know, gaited to non-gaited breedings are uncommon.