[Haskell-cafe] parallel Haskell with limited sparks

When I read about parallel programming in Haskell it is always about manual chunking of data. Why? Most of my applications with parallelization benefit from a different computation scheme: Start a fixed number of threads (at most the number of available computing cores) and whenever a thread finishes a task it gets assigned a new one. This is how make -j, cabal install -j, ghc -j, work. I wrote my own package pooled-io which does the same for IO in Haskell and there seem to be more packages that implemented the same idea. Can I have that computation scheme for non-IO computations, too? With Parallel Strategies, monad-par etc.?