Agreed, I don't think a limitation should be imposed on something such as changing hairstyles/tattoos and whatnot =) Players should be free to do so as long as they're able to spend the gil necessary. Now for something as drastic as changing gender/race/clan and such... I think that should be done with a ticket of sorts through account services.

As for sliders, I'd welcome it! They could impose a limit of course for just how skinny/fat you can make certain races, same with height so we won't get lalafell sized Roegadyns (as amusing as that'd be to see). I remembered the first wide game art they featured with all those races gathered, that some speculated the blond hyuran at the front looked to be a child and people thought we may be able to choose "age" for our character. That would have been interesting, but not totally necessary.

As for face sliders, further being able to fine tune our choices from the base faces would be fantastic, even if most of the time you're the only one to truly appreciate the differences in the choices you make.