Analog stick inteferring with trackball/mouse

I have an analog stick connected. It interferes with being able to use the
spinner and trackball in those games. If I put in the following entry for,
say, Tempest - tempest/device_joystick none - it relinquishes the block and
I can use the spinner. However, if do the same for Centipede, it deactivates
both the stick and trackball. Apparently, seemingly according to the docs,
they share the same driver or something. I expect there's SOME way to
differentiate the two but after pouring over the docs a spell, I can't see
how. Trying various manner of things hasn't enabled it. Surely someone's
encountered this issue?

Or maybe not, as for some reason I get no trackball input with the stock
values. I had to enter the following for p1 trackball:

input_map[p1_trackballx] mouse[1,x] -mouse[0,x]
input_map[p1_trackbally] mouse[1,y] -mouse[0,y]

...the axes of which, incidentally, are the opposite of the mouse (and of
course affect the mouse input if using one in trackball games).
-- 
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