Unless I'm missing something, it seems that privileges to modify Event Rules are an "all or nothing" proposition. There is no way to give a user the rights to activate/deactivate an existing rule without allowing that user to change all the parameters of that rule. This is a big shortcoming, because I would like users to have the option of choosing which Event Rules to activate, without giving them full editing access.
Is there currently a way to accomplish what I'm describing? If not, consider this a request to please add such functionality. I am sure that many of us would find it very useful.