When I first started with AC I too had the issue of not being able to use the already existing account/patient numbers. I know of no work-around for that although it would seem so simple to me to just allow one to put a number in the account number field without it being automatically assigned. Over the years however, it really has not made all that much difference. Patients in AC have a different number than the one in my PM program. I rarely even look at or search for the account number in AC while we do use it in the PM. The scheduler is also weak, I agree. But, these just a few of numerous things that many, many of us have begged for over the years....the simple things...that seem to keep getting pushed to the side in favor of "new and improved" features.
Leslie