http://www.wolfeyephoto.com/ExifToolGUI.exe

The latest version adds the ability to add lens, aperture, and shutter speed to your EXIF. Since those can vary, you may also select individual files. The other major addition is a confirmation dialog.

I addressed the "long path issue" but it's not an easy one to track down. Sometime the program just seems confused. Now, if you uncheck the (new) checkbox, prevent overwriting the original files, it should work in path situations it didn't like before.

Please let me know how it works for you.