No I do not want it to be changed, but having a option doesn't sound bad at all.
I personally love lock-on, I use it as much as I can. It's legit a focus targeting mode and the fact that the camera also locks makes it perfect, in my opinion, for dodging close AOE's like Nerve Gas, moving AROUND your target and nailing positions. This is up for debate but if you want positions I think simply turning the stick in a circle is easier than moving the stick in a specific direction.
The only times I don't use lock-on are very obvious. Can't use it in T13 when you gotta watch out for things like ES and Megaflare, can't use it in T10 sometimes because you have to be aware. when I can't use it, I simply switch out of it without effort. Sure it sucks going without lock-on but hey when you can't use it, you better not be using it.
I recently tried out Archer for the first time and honestly I think it gives a similar benifit. Whether or not I'll be able to use it I do not know, though.