I assume you are thinking about connecting batteries in series to raise the voltage. A good ES will look for that and catch it.
No, we are not looking into doing that. As of now, we want to do 7xEneloop or 6xAlkaline. The rule seems to imply that as long as commercial batteries connected in series do not exceed 9V, it should be okay. We are concerned that if the voltage anywhere exceeds 9V even though our batteries are less than 9V, we will be dinged. Alkaline batteries are typically 1.6V when fresh and with no load, but they are labeled 1.5V - so can we use 6x alkaline?
There is a prohibition against integrated circuits, but nothing against other electronic components such as individual potentiometers, diodes, transistors etc. We are looking for confirmation that the latter are okay.