Why are you sure that adding webcam will bring more users?
Changing something in the environment (e.g. adding WebCam) changes the dynamics, so the benefits of the change need to outweight the downsides (previously listed).
In addition, we need to be careful not to confuse IRC with other messaging media, anymore than we should not confuse a word processor with a spreadsheet.
By requesting that WebCam be added to mIRC, you are implicitly requesting that IRC include support for streaming video and sound.
If you want to use other protocols to support this "sight and sound extravaganza", then would it not be simpler to run another application (already optimised for this) next to your instance of mIRC?
Cheers,
DK