Any plans for a variable email address during 3rd party account creation?

Is there any way to have the ability of entering your email address at site signup time? (on a 3rd party site using OpenID, that is). So in other words, have it so that the email address on one of my profiles is variable, and can be entered when it's sending the information to the 3rd party site.

For various reasons, spam being the first, I use a different email address for everything I do online, so unfortunately with the profiles system I would have to go create an individual profile for every site I wanted to signup on anyways, with the new email address that I was going to use.

Are there any plans to add something like this? I really like Vidoop, but unfortunately this is probably my #1 priority with an OpenID provider, otherwise my email system kind of breaks down. I've already tried a couple other providers and none of them have it either, but I really like Vidoop, so I was hoping to get your thoughts on something like this.

Maybe none of the OpenID providers have it, and Vidoop could be the first. I know a lot of people that would benefit from something like this.