It's so obvious a name, that it cannot be anything else but a copyright issue in my opinion... either that, or the developers figured out that this is what everyone would call it, so they found another name... if you think of it, Twin Peaks was referencing two mountain peaks... and Summit has two mountain peaks in it's logo... which to me hints at the resemblance to Twin Peaks... if this was a joke, or simply copyright reasons i cannot say, but I do think there is a connection...