Holy-chan, your idea seems logical & reasonable on paper but the game is so tightly tuned that the servers are likely unable to handle it. We all complain about many things in the game but once you find out more about the actual working of the system as a whole it's a lot easier to understand why certain limitations exist & why things we all see as "easy options" (like the infamous butt slider) just can't be done using what we currently have.

That's not to say that such things won't appear in the future but realistically there would have to be a complete rewrite & restructuring of the system as it is akin to a whole new game. It might happen if the game continues to grow, like has happened to other MMOs but Square Enix are well known to be quite "frugal" when it comes to FFXIV & may prefer a new release over a revamp.