I use awesome WM and I didn't need to customize any of the keyboard shortcuts; it uses the windows key as the modifier key and as far as I know no other program uses it.

Also I don't get how the Windows 8.1 window management comes even close to the 2 programs you mentioned (Ratpoison and Awesome WM). With both of those (or any other tiling manager) you can do much more than just maximize and snap a window to the sides. (you have virtual workspaces, automatic tiling, better switching, etc)