Thanks for sharing and thanks for adding to wikitrail! You actually can have as many features as you want at the same place in the trail - you just have to add them separately as different features. So, for Addis Gap, you'll want to add: road, water, campsite and other (for the gap itself). Each can have its own location (GPS), its own distance from trail and its own description. In the PDF that gets created, they'll all be merged together at the same point on the trail.