Subscribe during user registration

This is a dream feature, at least for the sites I've been working with, but wouldn't it be great if the subscription module had the option to allow people to subscribe to whatever they can normally subscribe to when they sign up as a new user. Probably wouldn't work with threads of course, but the rest, categories, content type, etc would be great. I find I have to always post messages informing new users how they take advantage of the subscription features, but I know they would subscribe to a lot more if they could do it when they sign up for their original account.

Is this something others would benefit from? I was planning to hack some code in the next couple months and set this up for my own site, but if others would find this useful, I can code it into a module that does this. This brings up more questions though.

Is this something that would be best as a separate but complementary module to subscriptions, or should I work with this maintainer to integrate it with future versions of subscription? Either way, with a little guidance, I can start to work on this. May take me a couple months with my current schedule, but I do want to get this put together and help contribute to this community. As I said in a post in the bug forum, the subscription module is one of the most important contributed modules for drupal, imho, so I would love to start helping with this one if the help is needed.