Hi Scott -
You can edit a keyframe. This video goes over setting up and editing keyframes.
If you have not seen them, here are several tutorial videos for kOS.
You can also zoom in on the graph, under the Graph Options tab.
UPDATE: You can also move the motor to the "correct" position for the key frame you want to edit, then bring up the edit key frame window and click on "Move To Motor Position" button. This will update the key frame to the position the motor is in. Verified in kOS for Second Shooter v4.5.0 (Windows).
If you need any further help, please e-mail our support team at firstname.lastname@example.org. Thanks!