I bought a set of keys for the most common ones, and when I run across paper towel dispensers that spit out the shortest length of paper with the longest delay, I pop them open and flip the switches to give the longest length of paper and shortest delay. And fix jams and misfeeds as well if I run across them.
That's a thing‽ I just assumed that they did a fixed number of degrees of rotation per activation, so you got less paper as the roll depleted and the circumference got shorter.