Spamming isn't going to help unless you're alternating between your spam buttons. Still I doubt it would be better than just learning the timing.
Spamming tends to hurt more than help. But yes since you have exposed our secrets you must die now Hornet
You should watch the tutorial. This is the one of the hardest rooms in the game. I would recommend watching the guide and using the Baba Booey 1.0 version which means not jumping over the third guard and waiting for the fourth guard so you can jump over him to the door and go through while he spots you. No matter which strat you choose for this room it will take a lot of practice. Good luck.
The skip is possible on switch. I don't know why tabitan is saying you can't because thats just wrong.
You can see it being done here: https://www.speedrun.com/katana_zero/run/znr04p9y
Maybe post a video so we can see what mistake you're making.
Second place time is possible with controller so go for it. First place might make it next to impossible though.
In game time using the katana zero level timer is the only thing that matters. You are probably using real time if the timers are not synced up; which is all you can do if you play on the GOG version.
Steam version is the only one where the autosplit works. GOG does not work currently.
If you want to play through the regular game mode there is a misc. category called full run you can submit to but it's pretty much an obsolete category. Speedrun mode will skip all the cutscenes and cut the time in half.
No you need a video of the full gameplay. Also with the in game timer visible and showing your scoreboard at the end.
Just so you know you can record even if you aren't able to record the game directly through a capture card or screen recording. You are able to use any recording including from a handheld camera or phone as long as everything is clearly visible and game sounds can be heard.