Lyrra, there's a levade (static pose) included in the Conversano tack add-on set in my Freestuff, and a courbette as well. There's also a set of static standing trotting and jumping poses, and Daio's posted a bunch of poses in Freestuff too, along with some textures.

I haven't finished the travois or the Arabian tack yet, but I'm working on them from time to time. No idea how you'd fit a saddle on a Pegasus. I guess it would depend whether the ride is supposed to sit with hos or her legs over the front of the wings or tucked in behind. The Pegasus legend only mentions a bridle, not a saddle- the Greeks weren't into saddles, they generally rode bareback.

The description for the Heavy Horse says that it takes Poser horse poses. I haven't got it so I can't try that out, but it's probably worth a shot.

To change the subject, I've now completed the flying changes to change between the two canter lead loops (although it's not one you'd see in the dressage arena). I'll probably have to adjust the end points in the loop- at the moment, the loop doesn't allow a change of lead every stride because the change overlaps the end of one loop and the start of the next one. I'll wrap 'em up and stick them in with the freebie canter animation as they are, though- more when I've done that. :)