I'm running Rotorcross on OS X 10.11.x using a Turnigy 9x and a USB PPM cable. The latest update allowed me to change my inputs successfully, which is much appreciated.

When I have my overlay up, my inputs seem to range from -0.5 to 0.1ish. Some channels seem to be reversed. The quad is pretty much uncontrollable. I have my rates set very low, and every minor touch of the sticks sends it flying randomly off in different directions.

With a very light touch, I'm able to find the "middle" (slightly off-center) of each input, and actually maintain a terrible hover, but it's not really playable at all.

Is there a decent way to calibrate your inputs? Am I doing it right? I've just been holding a stick as far left as possible, seeing what the value is, and entering that in the "minimum" field for that input, doing the same for max, and repeating for all 4 inputs. Is there a better way?

You should, when using an actual transmitter, have the endpoints set to -1,1. This will give you full range. After that, you must manage to make full range of the your transmitter. This is all dependent on how your transmitter is giving the computer its signals, and how the computer (and the software you're using to connect the transmitter) is interpreting your transmitter's input. Rotorcross can only take a maximum from -1 to 1 of the OS's game controller interface.

any option of swapping channels my mapping is messed up

radio flysky fs-i6s

How do you configure the input channels? All messed up on simulator controller and I don't see where to configure like every other simulator out there.

I think the problem with randomness  could be fixed if the developer added support for deadzone (like in FreeriderFPV, checkout the demo)