Third party UI support?

[MagicofGaia]

I never play WoW but I played Runes of Magic, a WoW clone and they have incredible 3rd party UI support, users enjoy creating alternate UI and share it with others

will/should it be possible in FFXIV?

3 main points...

-Evangela, you suck... again
-Se does not support any 3rd party software, even Ventrillo because 3rd party software to SE is the devil
-As this guy states below, they banned accounts in xi when they found 3rd party software used. Not just speed manipulation, even something as small as a distance to target add-on. Several old friends were banned.

Given SE's stance in FFXI I highly doubt that they will allow use of 3rd party tools and will actively pursue anyone using them. Also I do believe that it states in int EULA for FFXIV that they will not be allowed either.