Map with zoom layers does not do digital zoom

I noticed this: I have map with zoom layers 12, 15 and 17.

When I am on layer 12 and zoom in, it just right to zoom15. there are not digital zooms to 13 and 14. The same happens when I zoom in from 15. It jumps straight to zoom 17 without intermediate step to zoom 16.

It would be better if OruxMaps does digital zoom for zooms without proper layer. As it is now, zooming is to harsh.