Tagged for later...waiting on improvements!
Use $userinfo[fieldx] instead of $bbuserinfo[fieldx] and you won't get the problem of your playlist ending up in everyone elses. In fact, it's not that your playlist is displayed in everyone elses, everyone else sees their own playlist in everyones profile. $bbuserinfo is related to the person that's logged in, $userinfo is what you want to use.
Would also be better if it was a complete product and you didn't need to manually create the profile fields. Maybe have a look at the product code used in
this modification and you can adapt it to this mod.
Great potential, just need more work! Looking forward to it when it's improved.