If you have a Razer mouse you can simply load Razer Synapse to automatically target enemies whilst you're shooting at them or scanning the battlegrounds by importing this macro:
Q.RazerSynapse - Speedy Share - upload your files here
Or you can replicate this macro in most any software, by setting it to press Q every .2 seconds; then set a toggle key.
I've seen a huge improvement in my score; and any time I kill an enemy I get 50 more points at minimum... It's a great way to get an edge on the competition for boosting experience.