Does this work with plugins like SimpleAuth or AuthPro?
Yes. AlwaysSpawn will look for the coordinates for the servers SpawnPoint and teleport the player to it when they have joined the game. Any form of authentication will not effect the plugin in any way!
What Will Be In The Next Version?
At the moment I do not have any plans for any major updates in the future. This means that I will likely only update this plugin in order to fix bugs or update the API. However, if someone does give me a good idea to add to the plugin, I will gladly add said feature.