One of the things I like most about S4 is that it makes it possible to succeed, and yet not have things work according to plan.
I had a simple but effective idea for including Bugs for software-and really for any B/R task. On extended tests, every glitch rolled adds a 1 point Bug instead of increasing the threshold by one. Each bug acts exactly like a level of gremlins for that piece of software. Meaning it reduces the amount of one's rolled needed to incur a glitch.
This can also be used for any hardware.
I also expanded this for foci as well using the cursed quality as a guideline.
That is about all. I have not yet come to a reasonable and simple procedure to remove bugs or flaws in a focus design, but I'll be thinking on it.