Nifty!

Nifty adds two commands for general server usage, /spawn and /up.

Spawn

Spawn teleports you to the current world spawn point.

Up

Up teleports you upwards to the nearest available position.

Other

Both commands can be toggled on or off in the mod config. The game will need to reload upon doing so, however.

All commands have builtin event callbacks (for developers) to disable usage of the commands, or have code run upon teleportation.