Do WP.com staff look at this section in the forum?
Here’s a neat idea, if it hasn’t been suggested yet – why not create a widget that shows my recent comments on other people’s WP.com sites? This could be way better than a blogroll since it could show readers where I have been to lately and where I have recently made comments. What a way to build communities!
I can’t code original PHP, but I do know enough about WP(mu) architecture that I don’t think idea is too unreasonable for the medium-to-long-term.