As it is right now, you can choose whether you want it split vertically, horizontally, or undocked with the dock button if you click and hold. This is just a different set of defaults if I understand correctly. It should be trivial to set it to how you want (and currently it remembers your prior preference, so hopefully that continues).

if you move the split from the bottom to the right side, it fits great... Unless I'm missing something?

I typically have sublime on the other side of the screen and the dev tools docked to the bottom - http://i.imgur.com/JByAoiK.jpg