. . . multi-select a range of keyframes (like when you sweep the mouse over a range and the area is highlited), but then drag that RANGE up or down, as a whole set of value changes. The reason is that I have Mimiced a head speaking some dialogue, but want to twist the head so that it is at a three quarter angle to the camera. Mimic has already applied subtle changes to the twist parameter, which I would prefer to keep, just change the whole range of points. I know you could do this with a change to the cameras position, but it has other uses this way, if its at all possible. Thanks !

Yes, just use the SHIFT key when you select the keyframes with the cursor.

Aha... yet another gem ;-) Many thanks Jeff, once again.