Hi there - I do appreciate where your coming from re: the footer widget and I support this concept but on which templates? I mean to say you can't be suggesting that for all of them can you as some themes have yet to be "widegtized" at all.
I also see difficulty with designing a rating feedback system for blog templates that would have any integrity when it comes to decision making. So many folks have so many very different needs and uses for their blogs.
Personal example: I don't cotton to Ambiru at all - huge header - no widgets - I mean zip, nada appeal at this end coming from moi. I like headers but I'm more heavily into TEXT content and all that header space to me is like WOAH! a huge waste od space.
I use lots of text widegts basically as sideblog short news article substitutes, as we have no templates with sideblog capacity.Ambiru does zip, nada, zilch for me without or without footer widgets.
However, photo bloggers, family and baby bloggers, cartoonists, etc. who have pictoral content as opposed to text, and lots of pictures to post love it. Others have indicated they think the huge header would be a perfect location for their youtube video and music thingees.
Do you see what I mean? In order to have a rating system of feedback on each blog template there would be multiple factors that come into play at the end of the party doing the rating that you and I may not have even dreamed of.
Not small among these would be specific answers by all the bloggers doing the ratings to a series of questions defining what exact purposes they intend to use the blog for and exactly which "thingees" they intend or deisre to utilize.
I think a better way to go for you is to carefully analyze your own needs, clearly articulate them in point form, post them on the forum to ascertain if others have the same or similar needs, and then send in a joint feedback request.