This is a feature request for MessengerPlus!  I would really like it if in preferences > notifications > sounds  if there were a setting for All users.  That way you could set a default sign-in/sign-out sound for everyone instead of having to set it for each group and/or contact.

you can set a sound for a whole group maybe set the same sound for every group? this would be a quicker way then setting every contact.

Yes i know you can do that but what if you have many groups or lots of contacts that aren't in groups?  I just think it would be nice to be able to set a default sound for all users.

There already is a sound for all sign in notifications. Go into Control Panel --> Sounds and Audio Devices and you can change the signin sound.

Yes there is.  Of course if you have that one set and a custom one for one of your contacts then you hear both play.  You can get by that by setting a default in the registry using MsgPlus Tweak and just disabling Messenger's default.  But you still can't set one for sign-out notifications.