Someone posted the question Circuit for RF Splitter, and @TylerStone pointed out that essentially the same question had been asked on electronics.SE. Everyone all over the web knows that cross-posting is rude, and I presume that we frown upon it here. But I looked at the Help article What topics can I ask about here?, which I understand is controlled by the moderators, and I see that nothing is said about asking the same question on more than one SE site.
Should we have an official rule against asking the same question on more than one SE site? Perhaps we could add something like, "Posting the same or a very similar question on more than one Stack Exchange site is considered rude, and is discouraged. Such questions may be closed on the grounds that they belong on another Stack Exchange site."
By the way, when I voted to close the question I mentioned on the grounds that it belongs on another Stack Exchange site, I was forced to indicate which site it belonged on, but the only choice was ham.meta.stackexchange.com. Since that didn't apply, I had to cancel my vote to close. Is that another setting that the moderators control?