Not a bad idea, OP. A lot of MMO's I've played have had some kind of anti-flood mechanism in place to prevent spamming. Perhaps 1 minute is a bit much... but maybe something along the lines of 30 seconds would be appropriate. I can log into the game inside the Inn and the moment I step out, before the screen has finished loading, my chat log is being spammed with RMT scroll. It's literally like a macro or something that is set to auto-repeat a dozen times within the span of 15-20 seconds.

It's disgusting. We have posting limits here on the forums, but RMT can spam all day long with nothing to limit them except blacklisting (which so far is unnecessarily complicated for such a simple thing).