When editing, prevent zoom when right clicking on features to access menus

[rburke]

When editing, some functions live inside right-click menus that appear when you right click a vertex or line. However, it's very hard to actually get this menu to appear when you want it to - in my case, it usually results in some unintentional zooming, as right click is also used for zoom and it's very responsive to mouse motion. I'm wondering if it's possible to adjust the sensitivity of zooming when you're trying to right click on a feature. Perhaps if you're snapped to a line and about to right click, disable zooming? In the case of a real feature-dense area where you'd pretty much always be 'snapped,' it's not too hard to use the Z key.