OSX sabnzbd daemon using launchctl with a wait for the volume to be present (using MountWatcher)

com.sabnzbd.SABnzbd.plist

?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.sabnzbd.SABnzbd</string>
  <key>ProgramArguments</key>
  <array>
      <string>/usr/bin/open</string>
      <string>-a</string>
       <string>/Applications/SABnzbd.app</string>
  </array>

  <key>KeepAlive</key>
  <dict>
    <key>PathState</key>
    <dict>
      <key>/Volumes/downloads</key>
      <true/>
    </dict>
  </dict>

  <key>RunAtLoad</key>
  <true/>
</dict>
</plist>

commands.sh

# create the plist file (insert the text from the other file)
vi ~/Library/LaunchAgents/com.sabnzbd.SABnzbd.plist

# BE SURE to change the /Volumes location to match yours!

# load it (be sure to have sab shut down before running this)
launchctl load ~/Library/LaunchAgents/com.sabnzbd.SABnzbd.plist