I'd like to add custom symbols for my nicklist instead of the standard server sent ones like @%&+ but I can't seem to find anything about doing this. The closest I've been is using /cline to change the nick colors, but that's not exactly what I'm looking for.

If I manage to do this though, let's say I change @Nillen to !Nillen, would I still be able to use menu nicklist to target the user in both channel messages and the actual nicklist?

Actually there is not any way to do this (by mIRC as default)
but i had already made an "OLD" suggestion about it and you can reply on it so to fresh it up: https://forums.mirc.com/ubbthreads.php/ub...60/Search/true/

Thanks, I added a bump to your thread

Nicklust can do that for you, but i dont know if it still out there, i used it a fev years ago.

You mean this dll: http://www.tg007.net/file-912

Yes, dont know if it work with the latest version of mirc, but you can change the @,+,&,% prefix to what you like, and not hard at all.

Thanks man, I'll take a look at it