Hi!

First, thank you! This is really cool!

I just want to point out the problem. Sometimes you want to retain the randomization order to make some predictable / deterministic runs. For example, before running the bot with scenario, ideally you want to have a quick dry-run, analyze it's results, and only then run it up.

As a suggestion, random.choice could be replaced with a randomizer passed in the initializer. For example, the end-user could instantiate Random class from random module with some seed value, and pass it down.

I might be able to create a PR for it, but not promising yet. Still, it might come handy.