Changing Range of Air Unit

Say I wanted to change the range of stealth bombers (and a few other units) for when me and my buddies play a huge map. We think it's silly that in a huge Earth map for example, a nuclear missile in LA couldn't reach NYC. In real life, a stealth taking off in missouri can bomb iraq and return home with 1 in flight refueling. We want to dramatically increase the range of nuclear missiles, stealth bombers, fighters, etc., to account for the huge size of the map and make it more realistic.

1) Is this possible?
2) In what file is this altered?
3) Could this be done for multiplayer use?

Thanks in advance for the help!