EAGLE still renders schematic and layout editors without respecting screen scaling and ignoring the benefit of a high resolution screen. It would be nice for this to be supported on both Mac (Retina) and Windows
Pinch and spread gestures on Magic Mouse or on any multitouch touchpad should zoom
Need more flexible customization in keymap - should be able to assign cmd+mouse scroll to zoom while keeping 2d scrolling working for mice that support it
Tool switching should be easier and key-mappable. Command entry should be a tool, instead of the default keyboard input, or should be configurable. More keys should be available than F1-F12 (all keys should be assignable)
There should be a ruler tool to provide more flexible measuring than the mark tool