Hi from Spain, Stepheng.
The way to do that you want is:
1-Menu "display settings" -> "Points" -> "update origin".
2- Press "tab" (unless you want to update the origin point too).
3- Select a new Z axis direction or press enter if you don want to do this.
4- Select the X axis direction. Its important to select a PLANE not a point. The x direction is given by a normal vector, orthogonal to the surface that you choose.
Then your viewcube wil be alligned with this x-direction.
regards.
Augusto Mora
Architect & teacher of Building Projects at CPIFP Pirámide. Huesca (Spain).
Revit 2014 certified profesional.