I have now added the ability to rotate the screen either 0, 90, 180 or 270 degrees clockwise. (as of Version 3.4).
It should be noted that doing so reduces the performance of the display in any mode other than 0degrees because the coordinates have to be remapped before being send to the screen.
The impact is mostly confined to text and drawing lines.
Filling areas such as with Clear() or Box() doesn't require remapping so is unaffected.