Profile customisation is fun, but it is NOT a mainstream feature. It may add a lot of complexity, security considerations and usability issues. For some sites it may be a suitable feature though, and I am sure that we'll have some limited profile customisation tools eventually. With that said, I am looking forward to modules and templates from 3rd party providers offering extended customisation features. Ideally we'd like to concentrate on UNA framework capabilities, including core performance, APIs and configuration tools, while allowing more vendors to come up with frontend functionality and visual customisation tools.