If we could Divide one global value against another we could use it to get percentages. Percentages for various things like objective completion, time remaining, control of a zone, trigger points for events, etc.
They could even be displayed in your aircraft's MFD objective page in the 'objectives info' section using the 'variables' function to display live percentages. I think they could make new and existing game modes easier to create, and they could be used to relay useful information to a players during a mission.