j0lt: I think that's still ultimately the fault of the port though.
Yes, that's true.
And, yes, you can't really make Jade walk slower. You can (at least in Pinnacle) tell the profiler to press Space as well as WASD when the stick is pushed more than, say, 80% BUT this will also mean that your boat will switch to turbo whenever you push your stick all the way.
The better solution - in my opinion - is to map space to both triggers (on an XBox360 pad) as the pad has more buttons than are needed.
I also added as slight camera movement when walking sideways (pushing left or right but not up and down) as I noticed the console port does that as well. The result is much less fiddling around with the camera via the right stick and truly a much more "consoley" feel to it.
However, I don't know if Joy2Key supports that option.