I agree. I read that book, and it caused me to buy a vendesign for sale that , after $100 invested, is still not route ready. There are plenty of ways to make other machines more useful.
To answer your question, to change the settings, you pull the ring clip off the candy wheel and pull it out. The center plate slides out and has a high side and low side. You slide the plate in the different slots with the bulge "up" or "down" to adjust candy given. Somewhere on here theres a diwnload where someone gave recommended settings for vendesign. But honestly, youre in for alot of headache probably.
As for the gumballs, either vend tab gum, or get 1080 ct gumbslls and vend 2 or 3 at a time.