It would be great to have a 'key plan" feature/view type in Revit. I envision it working something like this:
1. You create a "key plan" view which would be a legend (so that it could go on multiple sheets)
2. You choose which walls you want to use in the key plan and you could assign lines to match them by picking those lines.
3. You could create hatched areas with on/off toggles to show specific areas and parametric section/elevation markers.