I think that having to agree 100 percent is a great guideline, but I'm not sure how it can be enforced. Most people have at least one doctrine that their denomination or church teaches that they're not 100 percent sure they're in agreement on. Time and time again, we see folks come into the Lutheran forum, even the "conservative" Lutheran forum, and say they're Lutheran, but they have a problem with one or more issues outlined in our confessions and catechisms. Are they still Lutheran? Fortunately, we have some wonderfully knowledgeable pastors and theologians who can help explain the doctrines.
That's what I hope to see here. I would like to see this as a place where those who agree mostly with conservative doctrine are welcome to come and discuss such things... so we can encourage one another and help build one another up. If we start saying, "yes, but you're not conservative enough" (just like sometimes TCL has said, "you're not Lutheran enough") it is more divisive and hurtful than helpful. It is more useful to say "conservatives believe this" than to say "you're not conservative enough".
But then, that's the Theology mod in me coming out. *grins* I'm much more interested in discussions about the doctrine itself than discussions about who fits into which camp.