I think I need to be more clear. This idea is intended for FUTURE USE! I do see that currently this idea isn't feasible in the current state of the game as of NOW. But 2012 and beyond, this could be incorporated in the development cycle if SE so chooses and then new content can reflect this.

I also saw someones response of making this available as just an End Game Zone ability. I like that idea!

Also Subjob isn't the correct term, look when you change jobs and it says "Support Job" not sub. Thus limitations imposed on "Support Job" is up to SE. In this case the ability was limited to 50% of the main and that's where I think the term subjob came from.