hmm this does give me an idea though, what if the teleporters were special destroyable blocks? Without some kind of logic based security anyone could use one teleporter to get to another providing it was in range. Say the range in half a sector or so at max and each use either direction of a teleporter block or group of blocks would have a cooldown so it couldn't be abused too badly. Also restricting teleporters to astronauts is a very good idea so we don't have ships appearing out of nowhere. Larger teleporters shouldn't be able to move a larger amount of mass to a teleporter that has a smaller mass limit. Less blocks for a teleporter = less mass limit, more blocks = higher mass limit, try to send a larger mass to a lower mass limit and only what in under that mass gets through everything else either doesn't get sent or dies.
You can see where this goes and if done right it wouldn't be that OP and is good for those that don't want to land a few million tons of ship on a planet only to have the server admin instakill their ship for ever. XD Since in this setup it takes 2 teleporters to work and without using logic to lock it anyone could teleport to another teleporter from one.
As long as the range doesn't exceed half a sector I got no issues with it.