Variable to be automatically incremented in every 7 seconds.

You could count in milliseconds using Javascript (the world is overrun with samples of code that are used for timing).  Execute it when the action occurs, and when it ends have it change the variable.

BTW, I disagree with your characterization of it as a workaround. Workaround has such a negative connotation. To me, it is good design practice to extend the built-in activities to match your needs.