I found a way to set the seed.

I was thinking it could be a category.

How to use: https://streamable.com/dt6nv

Download link (zip file): http://www.mediafire.com/file/24g18igfg2np0in/fixedSeed+nullpomino.zip

That's a dumb idea and it takes away all skill and makes whoever has the fastest fingers and best finesse automatically the WR holder. This isn't minecraft, people aren't going to search for optimal seeds.