Togothe mega man community for the most part uses its own website for leaderboards. the zero collection can be found here on it: https://megamanleaderboards.net/index.php?game=166
except he calls them most of them speedruns in his video descriptions. not sure why you felt the need to bring up that technicality anyway, seems pretty petty.
your link is broken but regardless there's any% (get all the upgrades), and low% (get none of them). dunno how that contradicts what i said.
Mega Man games generally aren't tracked on this site, they're tracked on MMRTA. Specifically the board you're looking for is here: http://megamanleaderboards.net/index.php?game=64
having had to deal with third parties trying to sync the boards before, I strongly object that offer.
the delay is there to sync it to your capture feed since there's a delay between it receiving the signal and displaying it. If youre using an adapter (such as raphnet) then you might get extra delay. I'm unsure if it still does that for PC controllers but for PC you should just use https://chlorate.ca/input-display/
all it is is a different interface for the GBP (hence the name), so yes it should be allowed for all GB/GBA games.
afaik its not a feature in livesplit. you can change the total opacity to make it translucent but not transparent.
pretty sure its because the game switches video resolution for the menu. switches from 240p to 480i which causes a lot of issues with hd capture and modern displays.
the reason there isnt a 100% category is because you can't get 100%. you need to trade knife for nemesis, polar star for machine gun, polar star + fireball for snake, etc. you can't have everything at once.
you could do something like "all heart capsules" but I don't feel like that would be different enough to be an enjoyable run.
