It doesn't work this way.
If the scripter provided a way to activate features of the script by switches and variables, then you can use that option.
If the scripter wrote the script without that option, then you can't deactivate or reactivate the script.
Think of the script engine as the engine of a car - if the mechanic made a connection for you to control something from the cabin, you can do that - but you can't disassemble the engine while driving on the road with a hundred kilometers per hour.