Why can't we play URF in custom games?

Every one of my friends wants to come on and play league while URF is up, even the ones that quit League, so when there are more than 5 friends wanting to play, being able to just create a custom game and play against each other 3v3 or 5v5 instead would be really nice.

There was this option before, I don't understand why anyone thought it would be a good idea to remove it.

It wouldn't even need to be normal URF, it could be Ar URF, just let us play URF with more friends at once in custom games, please Riot.[zombie-nunu-bummed]