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Unfortunately no, there is no notion of "aggregating" T2-series threads (on sun4v, a virtual processor corresponds to a physical HW thread) like this into a "fatter/faster" cpu.
However, some of our newer T-series platforms, like those based on the T4, do have a concept of dynamic threading whereby there is some benefit to allocating a full core but only utilizing a subset of the threads at any time. And Solaris already knows how to do just that on these systems, via the so-called critical thread API.
Hope this helps.