I agree with tadatastic, there's no reason to have to hold this module for that long. It's a great module just that part is hard to deal with. I like his suggestions, maybe you have to click it once for the symbols to scroll, then you need to click it each time for them to scroll again. Module is defused as normal but you click when the symbol appears.

I absolutely love the concept of this module! However, I have one big suggestion for how it works. The hold mechanic of this module makes it particularly hard to solve in conjunction with needy modules (hot potato in particular). Unlike the vanilla button module, which one shouldn't have to hold for more than 10 seconds, it is common to need to hold this one for 20-30 seconds, in which time one cannot react to needy modules, the clock going off, etc. I think there are two simple fixes for this.

1) Make the symbols scroll automatically once the bomb is activated; module is defused as normal.
2) Make the symbols scroll once the module is interacted with; module is defused as normal.

This module has a lot of potential; it's just near impossible to solve in conjunction with needy modules in its current form. There are no other modules that I know of, mod or vanilla, that require this sort of hold time.