Thank you for replying so fast.
I am sorry but I don't understand your instructions. Perhaps we are talking about two different things? I used HeadKaze's mapping app to create an ini file called "robotron.ini" located in the "ini" directory. It only contains one line, which is reproduced below.
That ini file is supposed to reduce the corner sensitivity of any joysticks that are connected while playing robotron. MAME does not apply those sensitivity settings to the right thumbstick of JOY1(my gamepad), because I believe that it only sees the left thumbstick of JOY1 as a joystick, and it sees the right thumbstick of JOY1 as something else[(Z,Zrot) not (x,y)]. I am unclear as to how your instructions will change that. Would you be willing to give a bit more detail or an example? Thanks again.