Other users have requested the ability to control their PTZ cameras, and that is on our list of potential features to add to iCam in the future. Unfortunately, I can't give really give a timeframe for the feature. When deciding which features to add to iCam, it really comes down to which one is requested most and how difficult it is. Adding PTZ for each camera manufacturer is a complex process, and the number of users requesting it is fairly small in comparison to some other requested features.
Many users have had success viewing multiple cameras on the same computer by running multiple instances of iCamSource.
To do that on a Mac, you'll need to make a copy of the iCamSource application for each camera. First, run the first iCamSource and set up the first camera. Then run the second copy of iCamSource and set up the second camera. Make sure that all instances of iCamSource have the exact same login and password entered.