> Conceptually, it'd be nice if the mouse cursor indicated which mouse options you have - click, click and hold, rightclick, rightclick and hold - either directly or indirectly. Though right now I don't have a better idea on how to do that than displaying the items next to the mouse cursor.

This is impossible to do without a new callback for every item that can be used. I think it is not worth it to expand the interface for this feature. I can't think of any good way to display that information (on the mouse cursor) either. Sven and me were playing with the thought that items can actually define their own cursor image during usage but abolished that idea as being not worth the effort. I think displaying a crosshair just as the normal cursor is the best solution.

> Still used are the arrow, the +, the x (outside the landscape), and the scroll indicators.

Hm right, the scroll indicators. But everything except that could be removed: x outside the landscape is not that important, it can also be just the normal mouse cursor. The + is probably used while dragging - it could also be replaced by the normal mouse cursor.