It wold be nice to see protocol icons (somethign like this
http://goo.gl/Ddsg4) in Contact Details and the possibility (maybe just for admins) to add new protocols (eg. jabber,skype,irc...) and pages (eg. facebook,myspace,google+...) and the corresponding icon.
OK, but this isn't a core feat. now, it's just a mod.
The male/female images aren't a mod...
Ok, but i dont' see anything in Admin CP that permit to set male/female icons in profiles/messages.
Suggestion for MyBB 2.0:
Make use of those gender icons included in MyBB package by offering a built-in option to enable/disable gender icons in postbit and profile page.
Nobody like gender and IM/website etc. etc. icons in postbit?