Can scalability console commands be used for Users Graphics settings menu?

I came across these commands:

These seem to be setting the quality settings for various aspects of the game, now those settings are launched on execution so i have several questions:

  1. Can you use these as the quality menu settings for a packaged game? or do these become permanent after the game is packaged?
  2. I do not use steaming levels, I lave 1 for main menu and one for the main game-play. If I can use these as menu settings, then will these settings cross over to the next level?

To answer my own question - Yes and Yes