Multisite users complete profile at setup?

Hi,

I want to get new users to fill in their bio, add their twitter handle and upload an avatar. I won't use gravatar, as that seems to add a layer of complexity for some people.

A lot of plugins for registration don't seem to be multisite aimed.

Ideally I'd like to enable a plugin on the network that deals with this.

Any pointers? Enabling on each blog isn't an option as we need to scale pretty large on this.

thanks in advance!

Ross