Create key at (type frame number here)

Something I've done for almost 30 years that I keep trying to do in Blender (muscle memory, I guess) is to create a keyframe at the frame number that I specify.

At first I was thinking of something to be added to the i menu. However, since the Enter key isn't used yet for the 3D viewport, Timeline, Dope Sheet, or the Graph Editor, there's the opportunity to do what another app does:

[Enter], Type the frame number to create a key on, [Enter]