I don't really see a point in delaying posting times for this game for any% as competition is already happening. Any% should be pretty well defined - there is literally a place in the game where it tracks best time in Arcade Mode. It would be run in the way that Sert has already mentioned. Other categories will probably have to be worked out, that can be done in tandem with the any% leaderboard.

As for amiibo effects - there are two skins that can be unlocked either by using amiibos or by getting all 70 metals in the game: black arwing, and retro arwing. As far as I know, retro arwing does not have any side effects besides changing the arwing to look like the SNES version. Black arwing has the side effect of taking more damage than the regular one, effectively acting as the game's hard mode. Someone said that it can lock onto two enemies at once, but the regular arwing can do this too.

To respond to current discussion, I personally don't really care whether RTA or IGT is the standard for this game. IGT seems to be accurate from my point of view - IGT only counts time spent in game, and not in menu and is roughly 12 minutes faster than RTA from what I can see. For the purposes of RTA timing, I think that the timing should be from selection of "Start from Beginning" in Arcade Mode to loss of control after Andross (i.e. how Star Fox Assault does it).

In terms of other categories, I also agree with Sert's "All Missions" idea. It sucks there isn't a way to time this properly without erasing save data, however I don't really see a way around it. 100% might be something like "all missions, all metals." I don't really think that the training mode stuff is relevant since there doesn't appear to be an upper limit to score, and there are no extra metals awarded for any of it.

Some quick things I've learned both from attempts and by discussing with others about the actual run: -Boost meter doesn't update when any room in Corridor of Illusion is loading. -Gigarilla can potentially have a quick kill if you bomb its back twice -Sector Omega's boss's second phase can apparently also be quickly ended with a bomb, however I have not personally done this