Hello, Reason for option for always splitting window vertical (from Chris Jones on comp.editors):
Horizontal split was probably useful ten years ago but at least for those who favour full-screen mode and with displays that have well over a thousand horizontal pixels, nowadays vertical split makes a lot more sense, don't you think? I would add increasing popularity of panoramic screens (16:9) both in notebooks and in desktop machines. Probably too late for vim7 but maybe todo for vim7.1? m.