do y burst in full auto, semi auto or burst mode (when possible, e.g. aek, famas)?
Full-auto, ALWAYS, unless your weapon has got a burst-restriction. Controlling fullauto-bursting allows you to use different bursts in different scenario's: In close-range, you can use a 10round burst, in med range you can use a 7round burst, in the furthest ranges you can spam 3-round bursts: This is all to allow for the most effective way (read: FASTEST killing), even though it sacrifice efficiency (the amount of bullets you spend)