By far the best way to request changes is to submit feedback.
Apple reads everything submitted, and they often decide what features to implement/change based solely on the number of submissions for a specific request.
Thanks for the link, I've left my feedback.
I'm just a consumer/prosumer, so some of the things lacking in FCP X are not going to bother me, but I know that multi-cam support is essential, and supporting your cameras is important, so SURELY Apple will make these improvements. I do have faith in them, that they'll come through for us eventually. I just don't understand why they couldn't wait a while longer until more things were added, before releasing FCP X.
But I agree with Tom, it's better to vote and leave feedback than kvetch here.