Since Qt is multi platform, that's not an real option, but i guess, that you want an Windows installer (like vcredist) and that only gives more "issues", like for example the downloadable/installable/updatable "run-time" will be build with which compiler (Mingw? or since is windows will use the Visual C++??) so there "should" be too many "run-times" (and always there will be some peoples not happy that the compiler they use is not "represented")
And also for most applications you just need some dll's for Qt run-time (like most of the times QtCore4.dll and QtGui4.dll will do the trick) not the whole library.
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