The best mod I've found is called Enclave Commander. It lets you call in squads of Enclave troops that are air dropped by VertiBirds. They can also bring in Sentry Bots, can give air support, drop bombs etc. You can also make it so instead of Enclave, it'll drop in Brotherhood of Steel or Outcast.
Can't remember where the download link is, but you should be able to find it with Google.
you have any mods regarding graphic?like hi-res texture or something..thanx for the info..
right now i dont want to messed up with the gameplay,i just want to crank up the graphic..