Messenger Plus! intends in extending the experience of the users with other features. However, Patchou added skinning, with which you can create your own skin and hide whatever you want. If you just want to hide elements without changing the look of your Messenger, then you could use OpenLive, which is a skin that has some basic options for hiding elements and uses the standard look of Messenger giving users the chance to learn to skin easily. You could use it though just to hide elements if you don't want to give skinning a try.
Download OpenLive from here:
http://www.msgpluslive.net/skins/resources/tut-Open-Live/