I agree with DWMASS,
I don't use MBUTTONPAN, so the middle button on the mouse pops the osnap menu to the screen, an "E" will execute endpoint.
IF shortcut letters in your osnap menu are not underlined (to let you know which one is the shortcut) you can restore that feature (Win7) by:
1.Click Start, and launch the Control Panel.
2.Click Ease of Access.
3.Click Change how your keyboard works.
4.Locate the Make it easier to use keyboard shortcuts section.
5.Enable the Underline keyboard shortcuts and access keys checkbox.
6.Click OK.