You can edit the files for the original campaign, but I would not recommend it.
As these are from the original game it is out of scope to over-ride really.
From my experience when you get to the stage of too many patients you are usually ready to move on to the next level. However, what I have done in the past if it got too much is sack the receptionist and delete her desk until things cool off. They will still arrive, but as they can't check in they will wander a while and then go home
As for the captcha, it is to make life hard for spammers. After you have posted a couple of times though it stops asking you