Please no. I get the appeal of vast customization, but it would only undo all of the teams hard work in maling everything balanced. I enjoy our current system. It limits discrimination and is flexible as well. Take bard for instance, it can be seen as support with its healing limit break and song. Black mages get access to physicks, which I have seen save fights. Summoners can rez and all healers and tanks can dps well if you know your job. I personally love to keep defense buffs on my dragoon so just in case the tank falls I can take hate until the healer can get the tank up. Its limited but it means that regaurdless of the party build essentially no job is useless. I enjoy that balance.