I fixed many 2d barriers. So hopefully you dont get stucked. Still some places where it is possible (dont know exactly why since the 2d barrier is correct, sorry) Have fun
I like the courses that have smooth exits out of the controls and lot's of RC's and traps. You could do a lot with just a few "temporary fences". Move them to the event day tris so they don't screw up the basemap. Downside is you have to update the map. Easiest to draw the new walls directly into the map tiles with a drawing software. Seemed like the 2d barriers were much smoother this time. Makes a huge difference.