Feature request: setup multiple rules independently

Not sure if anyone else has that requirement, but it would be neat if we can setup multiple rules to different targets, say, one for 50ms latency and one for 200ms latency, to conduct tests without having to frequently setup and teardown comcast to switch rules. It's also beneficial when we need to simulate different network at the same time.

Currently executing comcast the second time results It looks like the packet rules are already setup. I'd be happy to create PR once having free time slot but before that, I want to ask you who already have experience on it: Are there any potential blocker to play with those various system tools for this purpose? To avoid bookkeeping, A simplification would be to set up multiple rules but teardown them all.