this is possible as of 1.4.8, though the name cannot be customized

Added Islands settings. Enabled by default

• Added command /island and /town island - requires nteleportation.tpisland to use, and nteleportation.craftisland to allow crafting
• /island add - adds a spawn point at the players current location (requires authlevel 1-3)
• /island - teleport to a random island spawn point
• /island <number> - teleport to a specific island spawn point
• Do not set spawn points in areas where players can build!

Added the same functionality for /town except it will not teleport randomly, but to the first location if you don't specify a number.

As stated, towns function slightly different than island teleports do. Also, the names should indicate that island locations can be dangerous, whereas town locations should be safe. Nothing about this plugin will serve that purpose though. You must use another plugin like Zone Manager in order to make it a safe zone (and I'm aware you did, but this is speaking in general to everyone).

Use /town add in as many locations as you want and once you've done this then anyone with permission can use /town <number> to teleport to a specific town. You cannot specify what the number should be, nor change it. It is added in the order that you create them, and the index number always starts at 0.

So if you've added 3 town locations then you can use /town 0, /town 1 or /town 2 to teleport to the first, second or third town, and so forth... if you only type /town then you will always teleport to the first town. This is done in order to maintain consistency with how it has always functioned, whereas /island will teleport you to a random location instead.

You can type /town clear to remove ALL towns. If you type /town add within 25 meters of an existing location then it will replace it with your new location.

There are no commands to visually show you where these locations are so you must remember them until I added that. Every location is saved in the config file. 

You will notice that outpost and bandit both have Locations as a setting. Ignore it. It's not used. It is only there because outpost, bandit, town and island all use the same 'blueprint' template for their config settings.