Cancel event-scripts

[khalil]

Thank you admin for your effort. Maybe it will help also for other user which will search something similar.

But for me it should be a parameter of event-scripts like "Execute on read".

There should be 3 options:
- unlimited (default),
- only first,
- only last.

This would end using of semaphore and add this missed property of event script.

Hello Dear Admin
Does the new firmware consider this in the event based script with the three options: 
Normal
First instance only
Last instance only