Use a fieldset when embedding bio fields on registration form

I love the feature where you can display fields from your bio node on the user registration form. However, I'd like to put all of them in a fieldset. Core already uses a fieldset for the username/email fields, and other modules that optionally inject stuff into this form (for example, OG) use a fieldset as well. If bio used a fieldset, too, it'd look more visually consistent. I can obviously do this in a site-specific module using hook_form_alter(), but it seems like it'd be a nice touch to just do it natively.

Is there interest? If so, I'll cook a patch. Otherwise, I'll just do it locally.