How to enforce telehub in only one sim?

I have two adjacent islands in one estate. I want to enforce the telehub in one island, because there's important stuff at the welcome area, but the other I don't care so much where people teleport in. The 'Allow direct teleporting' appears to be an estate-level setting (it might even be on the Estate tab, if I recall right).

What's weird though is that island A has ALWAYS had telehub enforced, but I only enabled enforcement on island B a couple weeks ago due to some problems we were having with a tenant's security system (visitors were teleporting right into this person's land and getting auto-ejected). So until I made that change, for a long time both islands were in the same estate, but had different 'direct teleport' settings. Now that the security system problem has been resolved, though, I want to go back to the old model, where island A has forced-telehub but island B doesn't- however I can't seem to toggle 'direct teleport' for only one island.

Any recommendations? I haven't tested yet what would happen if I unlinked the telehub on island B. If direct teleporting is banned and there's no telehub set, where will people end up?

If its not listed in search it wont be found, unless someone looks it up on the map and directly teleports to a location. otherwise it would default to 128,128,xxx.

I would just put another teleporter at the second telehub and diret then to the perfered location

Well actually that's exactly what happens with the second island. People locate it on the world map and teleport to the default coordinates. It happens a lot more often than I would have expected, considering how many sims are out there now- and resulted in a bunch of annoyed IMs to me from friends and random visitors when they were getting auto-ejected.

Also, I actually did do that- I set up both a Businesses and Homes teleporter right there at the welcome area. For some reason, it was too much effort for some tenants to provide me XYZ coordinates for where the teleporters should drop them off. Also, the business owners on the island don't like the telehub since their classified ads and land listings drop people in the welcome area now, and they don't think customers will notice the signs I've put up for the businesses or the welcome area greeter text that tells you to check the businesses teleporter. Oh well. Doing what I can to keep my tenants happy.

Well my public island is a single parcel, so I decided to allow direct teleporting on both islands, but I used the About Land tools to set and enforce a landing point on the public island at the place where my telehub was set. So I have exactly the behavior I wanted- forced telehub on the public island, direct teleports on the private one. =)