It'd be nice to have some syntactic sugar above parallel that would let us emulate the matrix axes of the Matrix Project type - a step that takes a map of variable/axis names with values as a list of possible values for the given axis, and a block of script to execute, which then generates all the permutations of those axes and runs them in parallel. This wouldn't make any changes to test reporting, FlowNode data, etc - it'd just handle execution.