Perhaps I'm wrong and I've misunderstood you, but it seems that what you want is a trigger that ONLY works when you want, not before. To do that, create a trigger, set its properties, conditions, etc. But now add at the final of the condition line "AND first". You can use any other word, you can put "AND gjepo" for example. Now when you want the trigger to work, put in a script, or other trigger, etc: first = true (or gjepo = true or the word you put). So now the trigger only will work when you have set that variable true (and when the others conditions in the triggers are met).