Only shifts, unless the tilts are significant.
In my work with 4x5 I just about use tilts only, and most of the time movements are relatively minor. The only instance I use shifts is when I want to keep a vertical... vertical, which is rare. Totem Pole in Mt Valley is one of the very few instances I recall where shifts were necessary. Very tall and very close, if you shoot from within the Sand Dunes at the base of the Totem Pole. I don't even use tilts with Spiderock since it is quite a ways from the rim of Canyon de Chelly and down below the horizon.
In many instances with landscapes minor distortions due to tilting the camera upwards are unnoticeable because there are no straight vertical lines. However, trees are one notable exception. So, when I want to shoot trees and keep them perfectly vertical, I use a telephoto because it allows me to stand further back and shoot level.
All this to say that the color cast would'nt be a problem for me if I used the P45 (which I may...). Seems like all this is a lot of ado about nothing, unless you use shifts regularly (when photographing architecture for example).