I've been developing cue sheets for brevets for a long time. Over the years we've developed an informative set of turn instructions that work very well and don't take up much space on a page.
Can you allow user to enter a custom turn instruction in place of the Right, Left, Straight, U-Turn, Generic, Summit, Valley, Water, Food, Danger, First Aid, Climb and climbing category notations?
For example, we often include "1st" or "2nd" in connection with a right or left turn instruction, especially useful when signage is missing. We also use TR or TL to indicate that a turn occurs at a T intersection.