Currently, once you have added automation to a channel fader, if you need to bump everything by, say, 2db, you need to select everything in the Edit window, and raise the level with the mouse. This is far from productive. "Tweak" mode would allow the user to move a fader, thus moving all automation points for the fader up or down by the same amount the fader is moved. This should be with the other automation modes (read, write, etc).
I hear this feature is present in HD... not having it in LE/MP makes no sense. This is not a market differentiator. Please include it in LE/MP.