Well, trop said he was told he couldn't sell a prospect by the world. And the veto pretty much confirms it. Myabe I read more into it than I should have.
As for rules and lack of response, it's your duty as commish to organize such a thing. If no one responds, post a set of rules you'd like to see implemented. If no one responds to that, send a sitemail to every owners with your rules, clearly state that there were no objections when you suggested them and implement them for next season. Document this with CS and, BAM!!!, there are rules. I shouldn't have to tell you how to commish but, since you said you don't care if your trades with bad teams make them worse for the future, I'm not surprised that I do.
Lastly, I asked those questions of every commish before I joined. As I said, I could have gotten two worlds mixed up and joined Hamilton despite a negative response and/or no response. I don't think so but it's not impossible.