How can I stop the Pow server from starting up at computer boot (OS X)?

Question

TL;DR: Is there a way to disable the Pow server from starting when my machine boots up, but retain the ability to launch the server manually via powder up

Answer 1

Use KeepAlive with PathState key.

PathState 
       Each key in this dictionary is a file-system path. If the value of the key is true, then the job
       will be kept alive as long as the path exists.  If false, the job will be kept alive in the
       inverse condition. The intent of this feature is that two or more jobs may create semaphores in
       the file-system namespace.

Create a file at path when you want to launch pow server.