Window Throttle
Allow users of MIRC to control the amount of bandwidth each channel window should take up. You could have: High, Medium, Low or actual numbers. This information can be set when the user adds a channel to his/her channel folder. For example, say a user is on 10 channels. 9 of those channels are very inactive. The user may give the channel a limited amount of bandwidth. While the remaining active channel gets more bandwidth.
Picture Info
Allow MIRC users to include a picture of them selves. When another user does a /whois or checks the info of another mIRC chatter he will be able to see a picture of the user. Of course the user can always check a box to disable that option.