I have discovered a consistent way to perform a glitch that has affected almost all Minecraft bedrock edition players. This glitch allows players to fly while in survival. However, it does involve using gamemode creative to get it working, from what I know so far. Would people be able to use this in their speedruns if they had to go into creative for a couple of seconds to get it to work? I'm asking this because I seem to be the first person to find this and it could save a lot of time.

I am going to continue testing to see if I can remove the creative mode section of the setup but, for now, I don't know any way to skip it.

No, this won't be able to speed up any run at all, considering that you have to be in survival the entire time, and cheats must be disabled.