That's what they did for the most part. The EADI and EHSI have some options as far as going into map mode, arc mode, bring up and turn off certain needles, composite the HSI and ADI onto one screen, etc. and the VSI changes to the TAS view or NACWS view when you pull the trigger. Other than that, there aren't many options on the other screens.
edit: I wasn't explaining this for you Riddller, it was for SEP. I wasn't trying in insult your intelligence