I often notice posts in the wrong forum - there is one at the minute in the RF, microwave and optics forum about rainfall. I hit "report post", but see that is only meant for spam, bad language or similar things.
Perhaps you could change the wording on the "report post" to include posts in the wrong forum are permitted. It currently says it should "ONLY" be used for spam <plust some other things>, with the ONLY in capital letters, so it is a bit intimmidating for someone to report a post that way.
Unfortunately this doesn't stop users from making useless reports like "please give the the code for ..." or "please delete my post" etc.
There are a lot of posts posted in the wrong category and althow I don't have a problem with someone reporting this it would be a problem if we got 30 reports a day about wrong section.
Usually moderators take care of posts in the wrong section and move them but there will always be a few that don't get noticed.