What arjan said. It's easy to adjust steps/mm for the E axis but you can't reverse direction without loading a different firmware so you have the 2 and the 2+ to choose from. The 2+ firmware works fine on the 2 except for that reverse rotation.
Another choice is to swap 2 of the wires on the stepper. Take one of the twisted pairs and swap those 2 wires (either pair is fine) and the stepper will reverse direction.
The problem is probably not with the feeder - it's probably with friction in the head. Best guess would be the teflon part - it's probably time to buy a new one. Do you have an Olsson block? If not getting one makes it so much easier to diagnose friction in the path from the feeder to the head (sometimes it's in the bowden but most often in the teflon part). And sometimes there is a partial nozzle clog. In call cases having the olsson block and the ability to remove the nozzle and let it cool and insert filament backwards from the olsson block lets you feel the friction.
If you have the 2, just take the firmware of the 2+ (the 2+ has a geared feeder, so the stepper rotates the other way around)
If you take the tinker firmware you can also easy change the e-steps to adjust for any gear ratio, just in the menu on the printer.
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