You raise some interesting issues; I quite like the qualification idea, a few lines on why the post is reblogged.
I'm a nobody here, I have no sway or influence on decision-making but I am able to have an opinion and on this matter my opinion is above. I think it could work better than the current wholesale reblog process and have more value for all but, of course, only those who make operational decisions could make it actually happen.
Thanks for your comment.