I'm trying to figure how beta works, but I must say that I'm a little dissapointed of some of the posts. Bethesda disabled the option to add mods for now, because the players who want to run beta(s) and test it, welcome to report fails/bugs and things that may needs some tweaks. If the players run mods or any kind of changes, it's more difficulty to say if it's game itself and/or the mods.
Cheers,
-Klevs