It very much depends what the backlink is, if its a forum profile or a non blog page then in my experience pinging will do absolutely nothing, zip. If it IS a blog page/post then I never have problems getting them indexed naturally.
Non blog pages (i.e. article/forum profiles etc) I will blast with scrapebox to get them indexed, plus, as acotut says, it gives them a little bit of weight.
I have no experience in creating an RSS feed of backlinks though, but I know of people who do this with good results.