Select Every N-th-no UI
If you want to select every 2nd or 3rd or 4th, etc edges, just select the first edge, skip the desired number of edges and select the second edge, then execute the script.
If you want to see the time that script needs to make a selection, just start MAXScript Listener.
Instalation: Drag 'n drop two mzp files in 3ds max, then go to Customize - Customize User Interface. Under "miauu" category you can find "Gap Loop" and "Gap Ring" scripts.
On the video below the script works 3 times slower, because of Camtasia and my old, single core PC.
Script is updated to version 1.3 for Skip Ring mode. NOw you can skip vertices, edges, and polygons.
watch the second video. :)
Instalation for SelectEveryNthVEPRing: Drag 'n drop selectvepringwithgap.mzp file in 3ds max, then go to Customize - Customize User Interface. Under "miauu" category you can find "Select Full Gap Vert/Edge/Poly Ring"