I actually would prefer it to zoom, which it sometimes does. A couple of examples: if you're using the tone curve tool it'll change the exposure for the level under the pointer; or if you're hovering over a vector it will scale the vector when all you want to do is zoom on the vector so you can move its fiddly control handles; but then if you're hovering over one of the settings dials by accident it will move the slider left to right. Absolutely something I wouldn't expect and have not seen in any other software. The UX is mind-boggling inconsistent and unpredictable.