The critiques which seem most relevant to this topic are ones which argue that any attempts at change will only be co-opted by the status quo, will make the situation worse. There should be some impact to the argument - whether it is discourse or policy related. Counterplans Plan is the focus of debate, therefore, topical counterplans, agent counterplans, etc. are fine. The negative may present dispositional counterplans - if the affirmative proves that the cp won't solve or is not theoretically feasible, then the negative reserves the right to revert back to defending the status quo. However, the negative should not be able to kick out of a counterplan if the affirmative straight turns it.
Permutations can be a test of competitiveness or advocated as a policy option.
Don't be afraid to advance an argument because you think that I won't like it. Any other questions - just ask.