Auto jump with item only

I want to make an item provide auto jump, but no one else can use it in my Deathrun. Can i like set auto-jump to 0 but people with the item sets it to 1? I’m not even exactly sure where to start, please help. This would be amazing!

Just to get the gear rolling, i have though about setting the autojump to 0 in the deathrun.txt & in the item putting something similiar to

ITEM.autojump = 1

But i have no clue if that would work, or if i am way off, & it is a lot more complicated then that…