hmmm... I see what you're thinking here, but a) InitCommandLineFlags is for initting command line flags, not doing this  b) it seems odd for cmdline to know about the context, we're spraying this concept around quite a lot of layers now; wouldn't it be a lot nicer for us to just create a new RestWorkload before the experiment and pass in the initial parameters to its constructor; then it can decide to stash them in a context or whatever as needed?