charliehall: That seems to be the most appropriate approach. It’s sad that people say kaddish in a meaningless way, like it’s a contest who can finish faster. I wait and answer the last person, because they are usually left out.
Wolf, I suggest you go near the Bimah and say it loader and at your own pace. The Shul has to wait for you and the others will get the message that it won’t save them the 5-10 seconds.