You can't DI during the momentum of a meteor smash, however small that momentum is. Don't make up AT's like "river teleporting". Its really stupid and pointless, especially on two stages that could suffer the ban hammer. Besides, you can't always make sure there isn't a klaptrap.
Custom stages will never be allowed in tourneys, unless a set one is made for a neutral stage, which is unlikey. Please, never ever used the term "overpowered" because 99.99% of people who say that are ******** and/or are looking for an excuse to make up for them losing. Hannenbrow is bigger than FD, heirgo, it is easier to camp. Moving stages are almost always categorically banned because they always distract from gameplay because you always have to move.
Also, stop double posting. Its annoying.
Those AT's are stage specific, and they are real. River teleporting is tricky, but you can avoid the klaptraps by entering only after they pass, they move linearly. These AT's are reasons why not ban them, and it's easier to counter camping on Hanenbow in my oppinion, because you can attack a camper from any angle, and below will force them to stop camping. This works because very few characters have attacks that can hit Directly below the platform. While fd, is flat and therefore doesn't allow for dodging of the camper-spammed attacks enough. Most campers spam projectiles (That's why most campers pick Fox, Samus, ect.), FD supports projectile spamming.
If all matches are played on the same type of stages, then there is a serious problem. The reason that's a problem is because that means that not all aspects of the game would be tested. Also, most of the spammed attacks are LAND-BASED in my oppinion, that means moving stages counter spamming. The main exception is U-air, which was already fixed in Brawl with the implementation of the new airdodge system in my oppinion. That's why I think that there should be equally ranked tournament divisions for the different types of stages, singles and 2-on-2 were seperated. Why can't stationary small stages, stationary large stages, and moving stages have their own divisions? The only problem with this idea in my oppinion is the placement of Wario Ware Inc., I would just seperate it from all the others. The reason to seperate it is because there might be people who like it (although I don't know them) and the people of the main 3 stage communities of Smashing don't like it as far as I know. Wario Ware Inc.'s seperation from the other three divisions could mean, a tourney for it, or none for it. And custom stages should be screened by a commitee at the Tourney, to rule on it's division placement. If they are allowed in a division, they shouldn't be neutral stages because one of the combatant's probably BUILT the stage, however if they fit into a division then they should be Counter-Picks in the division they fit in. Also, the "neutral" stage should be selected before character because there isn't such thing as a truly neutral stage.