I've been looking around for some time now for a Script that allows for a Custom Floating Shelf or a Floating Empty Tool Box (that you can fill yourself with custom tools.) (The one here a creativecrash is great except you can't save you additional tools, they disappear when you restart Maya.) I found both, but both are really old and do not work in later versions of Maya 2009 -2015. I see that there is something close to it in the new Modeling Tool Kit but you can't rip it off and place it in your scene. I'm not versed in Mel so I'm looking for anyone who has the skill and may be interested in developing something like this or has something like this.