Problems with R/C 6ch transmission

Hi,
I have a question again,becouse in am trying to include R/C in a big sketch that I am working.
I have some menus,and only in two option I want to use R/C contol.
So I need to activate and deactivate the interrupt but only this that come from the pins change
becouse I don´t need that the arduino hear all the time to the rc transeiver.

is this possible and how?

Thanks!!!!!!