I just played on .69, and yes the trackball does work for up and down. It is a little wonky, though. But what's weird as hell is I've gotten up to about forty grand or so before and gotten only a little farther I think. This time I topped at 24700 on the fourth all-three-discs-variable screen. Hmmmm.
I just checked, and 51400 may be my highest score.
...later: yeah, see, I just made thirty grand even by the second variable-level board, so obviously it didn't work right back then. Way wrong. Of course .104 the trackball don't work for up/down. Now to check whether .134 does.
....a little later: nope. Still don't work. Stupid.