My Bashkir Curly X Arab cross does wonderful with gaited horses, as she is gaited herself
We were told that she was by a Bashkir Curly stud and out of a "gaited" Arabian mare. Turns out, she exhibits the Curly Shuffle (derived from the Appaloosa shuffle) so she keeps up well with gaited horses. I have ridden her with Tennesee Walkers and Paso Finos quite often and she keeps up with the best of them. She looks like a Arab, but with curls lol
My friend also had a Morab mare that also seemed "gaited." That was most likely from the Morgan side though, as some can be gaited.
Here is a pic of my mare...