a UI builder.
by that plugin that lets you create various windows and add buttons, tools, or special view set ups for animating and modeling or dynamics and rendering. something that let you build and customize what is in front of you based on the task at hand. wether it is modeling animation or dynamics etc...
that would be very helpful to those who don't have time to learn the portion of UI building with MEL and the API.
notice i say the "portion" of UI building, i say this because it is an entire thing on it's own, nonetheless i'm not saying it's the hardest
either that or a noise generator, that can generate terrain or deform a surface and animate it. .. sort of like max modifyer thing.