Could you add a setting and/or research that prevents users from teleporting to different planets? I find these teleporters to be exceedingly cheap, which is great for local movement, but surface to surface transports should be vastly more expensive, imho. Seeing as how I don't want to ruin the teleporting fun for everyone, I'd like to request optional settings to restrict their usage.

Seconded. I can understand the value of interplanetary teleportation in a true sandbox sense, it feels too powerful for regular gameplay. A toggle in the mod settings to limit the teleports to those on the current planet would be welcome.

I agree that this should be an option that would make the mod less op for people who care about this.

I forked and added a setting for that here:
https://mods.factorio.com/mod/Teleporters-Balanced