PS3 controller soldering question

I want to use the analog joysticks on my PS3 controller for a project. Is it okay if just leave them on the PCB of the controller and solder extra wires attached to it. I’m not powering the controller so my guess is I could just leave them on the PCB, is this correct?

Probably not, it will be connected to electronic stuff and when that is unpowered it will look like a diode short to ground. Thus preventing it from working as you would like.