Total control of the auto mix

it would be greatly appreciated to have all the controls of the auto mix in the same menu.
I mean, why is the length of the auto mix in the preferences?
It should be just in the auto mix menu at the bottom of the screen.

I change often of Spotify Music, and for exemple , My christmas playlist is just classics that need to follow each others , which is totally different of a warm-up playlist that needs auto beat mixing.

Returning each time in the preferences to specify the length of the mix between songs is boring and more, it generates Errors when you in a hurry.
Can you imagine Mixing at 128 bpm the Christmas classics?

Thanks for this.