Just don't lock on targets as far as I know, the auto aim is the only way I'd Consider playing a ranger.
Don't know about the PC version but the console version auto locks on.
only pro's with a mouse are allowed to play without autolock. (and lucky me,i broke my mouse T_T)
I'm quite capable of playing without a mouse, and without auto aiming, thankyou. We should at least have the choice. Not all console gamers are complete noobs who can't handle manual aiming.
As a matter of fact autoaim is one thing I can't stand when using a controller. I always switch it off if I have a choice. That's what many years of playing UT2004 on PC with a control pad does for you.

Actually I'm just wondering if they could have put default bow attacks onto RT (with the longer you hold it giving the bow attack more strength) and have the A button (or whichever button you assign it to) as the jump button.