Check out this thread:
http://www.visionaire-studio.net/forum/thread/shader-questio... don't ask me how to edit the openGL shader script though as I have no clue.
If you are just wanting basic reflections & don't need to show character reflections then you could create them as regular animations. Technically you could create character animations too by creating an npc character & have it follow around & mirror your characters animations, but it would probably require a fair bit of work on your end to get it looking & working exactly as you want.