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I think positive/negative is more confusing then left/right (for thrust angle) or in/out (for toe). But whether you call it negative thrust angle of left thrust angle you still have to be able to quantify it. If you measure the angle between two intersecting lines (e.g. centerline and thrust line) in degrees, then I know exactly what you are talking about; on the other hand if you measure it in inches, then you have to specify how far away from the point of intersection you take your measurements. I guess there is some implicit standard when it comes to measuring vehicle toe, thrust angle, etc.
Anyway, my right rear wheel points in (toe in), my left rear wheel points out (toe out) – so my rear end has a tendency to go left and therefore push the front of the car right. I have a substantial negative/left thrust angle.
The Maxima has a non-adjustable rear toe, so I think that I can align the front wheels to fix the thrust angle – I probably need left front toe out, and right front toe in. (In any case the total front toe should be in.) Then the car will go slightly sideways but will not pull to the right.
The idea of adjusting the front suspension in order to correct the thrust angle of a car that has a non-adjustable rear suspension can be found if you go to this site, for instance: