AE Slip Edit without moving keyframes

Most of the time I use the Slip Edit tool, I want the keyframes to keep their place in time. AE has no fast solution for this. There is a workaround, but I think AE needs a more comfortable way to do this. Just by ALT-dragging for instance: drag the Slip tool to take the keyframes along, ALT-drag to only move the footage time, not the keyframes' time.