Yes, you can. Press the F6 key on your keyboard to launch PerfectIt's keyboard mode - you'll see a small picture of a keyboard appear. When you want to return to your document to make changes manually, press F6 again to exit keyboard mode, and the keyboard icon will disappear.
The keyboard controls for PerfectIt are:
|Key to Press
|Back to the previous issue
|Jump to the next check
|Toggle preferred version
|F1 or H
|Fix current location
|Fix all locations
|Undo fix at current location
|Space or Return
|Press active button
|Go to next item in list of locations
|Go to previous item in list of locations
More details can be found on the Keyboard Controls page of our user documentation.