The alt-click-drag on keyframes in the dopesheet is supposed to shift the currently selected key to the direction you drag it to, as well as do the same to all the keys to the right of it.
Is that right?

SLOT IMAGE KEYS LEFT BEHIND
When I do this to the summary row, the slot image keys get left behind (ie, don't move at all while all the other keys move).

ALSO UNDO BUG
Also, when I undo this operation, the undo is only applied to the column I click-dragged on. The shift in time the operation did on the rest of the keys isn't undone. (This includes all types of keys.)

I can only imagine. ;___;