Since scrolling by dragging was enabled on touch devices, it has become very difficult for me to execute a normal click (i.e. to select a unit, or select a destination for a selected unit on the map, etc.). This makes it near impossible to play on my Android Nexus 10, since basic clicks are, well, pretty basic and important.
I tried long and short presses, and double clicks. Somehow I manage to select something eventually, but it takes ages. So I no longer even try to make my turn on a tablet device.
While it is nice to be able to scroll the big map view through dragging, primary clicks are way more important. I think that drag&drop is a known problem for touch devices, so I would guess that finding a cure that works across all devices is known to be a very difficult problem. Hence I would suggest at least an option to 1) disable drag & drop and 2) show four arrow buttons underneath the normal game buttons on the right hand side (i.e. move,defend,etc.) that scroll the map view around. That ought to be a very simple thing to do, and it is pretty much guaranteed to work too.