Just to add a little of background why it is needed: The Chrome Lightning inspector shows performance graphs and component tree. Component names are equal to what "toString()" method returns. If for example component ConcreteCmp extends BaseCmp - lightning inspector will refer it as BaseCmp, or the top-most component in hierarchy. The graph looks like tons of components of the same type. Difficult to distinguish which one took long to render and which ones are OK.
Question: Is there a way to override the value returned by toString() method?