@Eff0r4 still to be decided. I think the mods are going to vote on it. Chances are it will be split.
Because verifiers & mods are real people and (surprisingly) don't have superpowers that allow them to instantly watch a video and find all the rules being broken (if any). Not to mention there are people whose runs are in the queue, who mind you, have definitely been waiting patiently for more than 5 hours.
No, please refer to View Rules -> Game Rules -> Resource Pack/Mod Rules
Resource packs are allowed as long as they are not too dissimilar to vanilla. No UHC ores and other obvious advantages as well. No pumpkin blur wouldn't be allowed because of that.
To put it simply, the fastest way to restart a run would be to reset for a good seed on singleplayer, and then when you have a good one, DON'T MOVE and set the world to LAN. Than either port-forward or use Hamachi to host a server like that, then/time set 0 and let your friends join. Another option is to use a realm, which means you have to use 1.15.2 or use an external host which may take longer to reset.
@KilleDragon Don't get ahead of yourself chief. I made the comment because I submitted a sub 5 minute run by doing exactly that 😂. Friend and I thought it could be funny, knowing it would get declined. But it's all g, I gots myself the WR anyway with a different method to get sub 5.