I'd quote myself but its better to have each bug in separated threads.

The zoom using mousewheel is terrible, you get completely lost from where you were because its too slow (the response after you move the wheel). And there's no focus, and this is a major problem, because it affects to coords aswell.

clicking the 'zoom in' and 'zoom out' options works better, but still you lose the focus.

I'd get rid of the mousewheel function because you'd need much more resolution if you want to make it work like a real zooming.
Right now there's only 7 sizes of the map, you'd need at least 7*7=49 sizes of the map to make it look as a real zooming, and use the 'zoom in' and 'zoom out' options to change between the 7 standard sizes.

But still the focus is the big problem, in the lower resolution you see as the map goes up when it should be centered.

To make a pro zooming you'd need more sizes, more response speed and also to be centered in your window, just like a cartoon, right now the poor cartoon is slow and moving up

or even better, the focus should be where your mouse pointer is, but I guess I'm asking for too much