do you guys think it would be a good idea if the bitcoin community developed a set of "acceptable uses" for bitcoin trading
Yes, that's a good idea. Freedom does not mean that everything should be allowed. Freedom only means that you are allowed to do everything which doesn't hurt others. Therefore it does not make bitcoins a "less free" currency if we would state that we e.g. don't want to see a bitcoin slave market.
Of course, this statement is (hopefully) self-evident because the vast majority of people (also in the bitcoin community) agree that there should be no slavery at all. But, for instance, when politicians start to demonize bitcoin by claiming that some people created bitcoins for the purpose of doing criminal and evil things, one could easily point to such a "code of honor". This code of honor would then signalize that most bitcoin users are not aiming for a opportunity to do "evil" things without getting caught. But that they rather want to have a currency which is more trustworthy than fiat currency, a way of online payment which is more convenient than paypal and credit cards etc, which they just want to use for their everyday buying and selling.
Maybe, such a code of honor could than be used as a guideline for deciding to which bitcoin businesses the wiki (or other bitcoin-related websites) should link and to which not. Formulating such a code of honor has nothing to do with any enforcement of rules (which anyway cannot be done without the use of force in meat space). It would rather be a way to formulate the "mission" of bitcoins, as the majority of bitcoin users sees it. And this would be, in my opinion, a good thing.