I don't have that SP add-in, but maybe this AppleScript can help you identify the button that turns it on/off:
property paneID : "com.apple.Network-Link-Conditioner"
tell application "System Preferences"
activate
set the current pane to pane id paneID
end tell
delay 0.5
tell application "System Events"
tell application process "System Preferences"
set oWin to window 1
oWin
end tell
end tell
If you run this in Script Debugger 7 , you will see a hierarchical list of elements in that pane, like this example from another pane:
From that you should be able to identify the button/element for the on/off switch.
Most likely you will want to set its "value" property to "0" for off and "1" for on.
If you need help with the script, post a screenshot showing the details of the element of interest.
Yes, but I am very busy. It may be a few days before I can continue to help you.
Meanwhile, you have all the tools you need to solve this problem. Exploring in SD7 and some trial-and-error scripts can lead you to a solution.