Use slider to zoom in and out

As I know, there are two ways to zoom in : using Zoom slider and right clicking the mouse.
We can right click a spot to zoom in or zoom out, but we have to right click many times to make the spot as large as we want, and maybe right click a few more times to zoom out if the spot is getting too big.
It is faster to zoom in or zoom out with Zoom slider than with right click, but each time you adjust the slider, you are moved away from the spot you want to zoom in or zoom out. Actually, you are moved to the center of the board. So, you have to move your cursor to the spot each time, in order to see whether the spot is large enough or not.
I suggest that after we use right click to tell the system the spot we want to zoom in or zoom out, make the slider stay in the same spot when we adjust Zoom slider.