So, between you and me, since no one else is listening....I only just found out last month that you can actually target the thrusters of a ship. I'd seen all these people saying things like "target the FSD," "nuke the powerplant," and the like - and I thought, "What a bunch of clever role play!"
Then I accidentally right bumpered one time too many past the contacts tab and voila. "I've yet to get very good at it, but I least I know you can do it now" said the CMDR with an EXPERT rating in combat.:x
You can set a key bind to "target next subsystem" in the controls section and them just keep on mashing that button until you reach the module you want to kill.
Or as is more usual the module "after" the one you want. Then it's just a case of mashing the button frantically again several times, then slowing right down until you land on the power plant or what not.
While all the time manoeuvring for position and keeping one eye on the Comms for incoming cops.