The Skyscale is an awesome mount and is an excellent addition to the mount roster. However it has one major flaw like the Griffon: it's a bird that really can't fly.
I'd have to say this is one of the most annoying things Arenanet has done in the game - given us a flying mount that can't maintain flight.
I know everyone has their idea of what the mounts should be and do and so do I and here it is:
Skycale: Grant full flight without having to land to recharge. ELIMINATE that stupid kung-fu never-let-go-grip. Keep the ability to hover.
Griffin: Grant full flight - no hovering but add superspeed much like the beetle but without having to dive first.
Roller Beetle: Keep everything the same except perhaps improve the high speed control.
Jackal: My favorite mount! I love the way it looks: it's made up of falling sand how cool is that? It's really unique because it's the only mount capable of traversing the sand portals. I think improving it's ground speed would entice peple to use it more.
Skimmer: No need really to change this one
Springer: Other than being a cute little bunny this mount's usefulness has been nerfed since the Skyscale came out. I would give it "jackrabbit" speed and double the jump height to make it more attractive.
Raptor: A great mount that doesn't need to be changed.