Setting keyframes with default linear interpolation Is there a way to add keyframes (I key) with LINEAR interpolation as default instead of BEZIER?

I often animate cyclic motion (e.g. planets orbiting around the sun or textures spinning about Z on a sphere) and the created f-curves have BEZIER as default interpolation. This requires me to immediately change the interpolation to LINEAR.

I was wondering if there is a magic key that I can use to have the keyframes added as LINEAR interpolated, or at least have a global setting that I can set to have LINEAR interpolation used by default.
I also prefer Linear interpolation for my initial keyframes, and set is as the default for new keyframe points through User Preferences > New F-Curve Defaults > Interpolation: