I had this in the 'Exploits' forum, but was told it was USELESS, so probably belongs here...
I always thought mages look a bit weak when slowfalling, what with all that flailing about. I like to look intimidating in BG's and such...so I slowfall the badass way!
Just cast your slowfall, then mount up and make your jump. Use an instant-cast while in the air, like your Frost Armor or Slowfall spell.... viola! Still-as-a-statue slowfalling. You just stand there with your arms at your side.
Simple but fun! A guide and example is here:
YouTube - Slowfall while standing still...
~ The Wizard Trokair
<Walks Through Walls>