Yeah well a good way to take out rust is to play the ums micro wars stuff.

To know if your good at micro !
Can you kill 1 reaver with 8 zergling ?
Can you kill 12 zealot with only 10 ?
Can you kill 8 zergling with 3 dragoon ?
Can you kill 10 zergling with 3 zealot and 3 probe ?
Can you kill 8 zealot and 8 dragoon with 12 zergling and 12 hydra ?
Can you kill 8 marine (no stim) with 10 zergling ?
Can you kill 4 zealot with 6 scv an 2 (no stim) marine ?
well you guyz get the idea.
In micro wars ums thats what it make you practice !