# Hotkey (or other quick way) to insert a keyframe for only one component of a vector-valued property?

I want to keyframe only the x-value of the rotation while the y and z are being animated independently. (If you want to know why, I'm making the camera continuously revolve about the z-axis at the center of the scene and using the x rotation to change the polar angle at one part.)

I can achieve the effect using the dope sheet to delete the y and z keyframes after I use the I hotkey to create a keyframe for all three values, which is honestly not so bad, but it seems like there should be a Ctrl + I or some other way to have more fine control of keyframes without having to open the dope sheet.

A quick way to insert keys to only some channels is to create a Keying set. Right click the input, and select Add single to Keying Set. After this when you hit I in the 3D view or other editors, the keyframe is only added to the channels specified in the Keying Set. You can select which Keying Set to use in the Timeline editor's header.