Temporarily setting various options (ex: viewport lock)

[Nate Rickett]

I'm trying to make an activity more mobile friendly, while still allowing users as many options as possible. The issue with this particular activity is that the graphing calculator is set to the full width of the screen, and a decent amount of the height. It takes a savvy user to find places to click-drag to scroll the webpage instead of scrolling the graphpaper. I know I can set lockViewport: true in the constructor, but that also removes the option from the menu. I'm hoping for a way to leave the option there so a user can uncheck the box, but after I have a calculator instance, I am able to check that box initially in my script. Is there a function that mimics checking the lock viewport box?

Thanks for the help!