Getting a lot of complaints from players about the fact that tpmarker doesn't stop people from grid teleporting directly into their homes.  How do we set it in the plugin so the grid-teleport (tpmarker) doesn't let this happen?

remove the permission from them. they should not have it. it is intended admins get a choice if they want the functionality to work or not, and so a permission was added for that reason. it is not for players