Minecraft – About security on Minecraft plugins

You will likely just want a minecart dispenser of one of the two formats (these ones use Powered Rails for the dispenser booster) which will then have additional track to move the dispensed cart up to where you want the button placed.

Hope this helps.

You can take a look at mineOS, a small Linux distro that runs only a minecraft server. Put that on a dedicated machine or in a virtual one and set your router to forward the standard port (25565) so that machine's IP. Even if the (virtual) server is compromised it is virtually impossible to break out and cause harm to your remaining network - assuming your network is not setup without any password protection or authentication mechanism of course. If you want to be even more safe, set up a DMZ.

Alternatively, set up a LAN server that cannot be accessed from the internet and offer a VPN connection to those you want to allow access. This is less secure but probably easier to setup.