currently, no, there are not tasks modules that will group like windows together. i'm not entirely certain what you're talking about here. do you mean multiple instances of an application? or do you mean all windows, including child windows, like the toolbar windows of photoshop, of a single instance of an application?

either way, i don't imagine it would be difficult at all to do this in a litestep module, it just needs to be done. carbon already does it, as a matter of fact.