A major frustration of many is the lack of a keyboard shortcut to edit a clips rotation, scale and even position from the timeline in Premiere Pro. The normal order of operation is to select the clip, open the Effects Control Panel and then mouse over to the values and change them.
While this is not a direct keyboard shortcut to edit these on the fly from the timeline, you can edit using Keyboard Shortcuts. Here is how.
Select your clip using D and then press SHIFT - 5 to open the Effects Control Panel. Tab once to move to the first Position value, the horizontal value. You can press the UP or the DOWN ARROW to change the value by 1.0. If you hold SHIFT and UP or DOWN ARROW, the value changes by 10.0. You can also type in a value into the field. Before moving on make sure to hit ENTER to confirm the value.
Press TAB to move one value down the list. If you TAB enough, you will end at the top of the list. If you want to go back one press SHIFT TAB to go in reverse.
Once you are satisfied with your changes you can press SHIFT - 3 to make the TIMELINE PANEL the active panel and keep on editing.
Cheers - Mikey