Adding a JA for a different stance for spirits could be an idea...however It may be a bit unbalanced/unfair due to the fact we have to cast a avatar/spirit in order for the proper effect.

Whm and Sam can switch at will, unless they make avatars 1 sec cast.

In the end spirits being so random is lame, just as lame as BP based on game day/moon phase. Which is why I'm glad to see Diamond Storm etc.