If someone WANTS to use webcam, they will get the script to use it. If they DON'T care about webcam, then they will not. It is that simple. You make it sound like having everyone get the script is a problem. It isn't. If someone wants to do webcam, they'll get it. Just because you want to use webcam doesn't mean everyone else has to have it as an option.
Sure, you can say that you have the script but can't use it since no one else has it. That isn't the fault of the script. That means that other people don't WANT to use webcam in mIRC. If they really wanted to use webcam in mIRC, they'd get that script.
Many people use only one IM client and not all of them. Sure, they could install all of them or use a multiple client like Trillian so they can talk to people on all clients. If they care about that, they will do so. If they don't care, then they'll only use teh client they like. It's really the same thing. If someone wants to do it, they will.
And... Just because you and others dont want webcam support, others do. What is the easy way to resolve this? Add the support and who likes to use, fine. Who doesnt like to use, ignore it. Just we have SSL. And comparing SSL and Webcam , webcam is more and more used than SSL.
Or you are telling me that I will have to contact all hundreds of millions mIRC users and tell them that if they want to use webcam on mIRC they will need to download ByteCam ? This is a little funny, isnt?