Looks really nice, would be cool if you could also view nicks by nicks in the dialog.
I also added an ON EXIT hsave to mine so I can collect data between diffrent sessions. It seems that the dialog only shows information about users currently on the channel perhaps it would be nice to optional see all users/addresses that were on the channel in the past.
If got one problem with the searches, they always fail with "* Invalid format: $numtok" I have to study a bit further what is the reason for this, an idea anyone? (mIRC Version is 6.16, I know its very old...)