Sorry to drag this up again, but I am trying to get this really handy function reinstated before JetBrains release the next version.
The main reason that I found the windows splitters so useful, is that it allowed me to see two ends of a really long file, without having to split the whole view and jigger files about to get the view I wanted. It made life easier, basically.
Don't let this function go silently into the night .... your favourite could be next! ... :)