Hi *, I've just uploaded a new component prototype to the sandbox today: the selectManyPicklist. Many users have asked for this component in the past, so I think it is a great addition. There is still some work needs to be done (styles, etc), but now it is working pretty ok.
I guess it will go into the next build, so feel free to test it! I will be working on the remaining implementation and the necessary documentation. I've already put an example so you can check it... Hope you like it! Regards, Bruno