I am using for like 1 years this addon by @Luke Foreman : http://xenforo.com/community/resources/post-ratings-taking-likes-to-the-next-level.410/
But I would like to switch back to the traditional like system because I think queries on a big board takes longer than XenForo's core likes.
My problem is that I can't just disable the addon : if I do that my members will loose a lot of points and loads of evaluations will be lost.
So I would like an importer, it would convert every "post rating" evaluation to a like AND update each members total like.
If anyone is interested, tell me, I could pay. Since I have a lot of data, it would be safer (and easier) to do it as a CLI script.