I know there is an old version of Yahoo Messenger for Linux and i have found it at http://linux.softpedia.com/progDownload/Yahoo-Messenger-Download-2.html
I didn't manage to install it because some dependency is missing. I think it is too old to be used in Mint.
I guess we are stuck with Pidgin for the moment. It seems to be the best solution. In the past months i have tried Kopete, Empathy, Gaim, YM with Wine and a couple of progs i don't remember and for the time being Pidgin is the best among the crowd. I hope that someday Yahoo will understand that it should support Linux.