Traditional zoom/pan behavior

[wahlatlas]

The current implementation of

    .applyBehavior(mapmap.behavior.zoom())

is certainly very elaborate but to my taste not always superior to traditional zoom/pan behavior via the mousewheel and simply dragging the map. Above all the movement of the map on click to zoom is kind of sideways. What is the appearing ring (partly cropped sometimes) supposed to do?

[wahlatlas]

Currently mapmap.behavior.zoom() is almost impossible to trigger on touch devices, at least in iOS9 (iPad/iPhone)