API feature to prevent listing of marker sets

[n-aspen]

Is your feature request related to a problem? Please describe. Some marker sets I'd like to create either don't need to or would be affected negatively by listing or teleporting to individual markers.

Describe the solution you'd like I'd like to be able to change some marker sets with the API so that you can't list their markers on the web page. That would remove the ability for players to view the specific markers contained inside and their ability to teleport to them on the map.