It isn't a big deal and a new user may not understand where things go. Better to just explain that most forums do not allow or want duplicate posts and just let the person know that they should never post something more than once on a forum. If they aren't sure of the right location, just mention that in the OP and ask that the moderators move it if it needs to be in a different location rather than posting multiple times. That's constructive feedback and better than calling someone rude.
To the OP:
Others have requested CM for console now and then since the console version was released. There may be responses from devs in one or more of those threads if you feel like using the search function to try to find them. It's not the easiest topic to try and find, though. But you could do a search that includes all words and use console and cm and see what comes up. Or wait and maybe you'll get a response here. I'm not sure if the reason not to include CM on console is due to some issues with Sony/MS or some other reason so I can't give you any specific information.
Also, as far as a good place to put a thread asking for something to be added, the Pimp Dreams forum is the requests forum here. Support is for help with problems and although General Discussion can be used to discuss pretty much anything that doesn't break forum rules, things get lost quickly there because there are a lot more posts in that forum. But please don't create a third post in Pimp Dreams. Let moderators move it if they want.