I tend to leave my MPSC's on most of the summer as I get too lazy to swap tires between track events (I try to get out a few times a month).
Unless you are going to be at the track and want the "R" compounds for that use there is no reason to have them as a street tire. They wear out quickly (both tread wear and more importantly heat cycles), aren't great in the rain (to put it mildly) and since you can't get them up to temp with street driving they will actually perform worse then a high performance street tire.
So it is possible to use them on the street but unless you are at the track all the time it isn't a great option imho.
Marc
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