Hi - I'm sorry for the delay in answering this email. I was away from my desk for a day or two 🙂
Do not add print page numbers where none exist. For the front matter material that has no page numbers, don't consider them implied. If ANY of the print pages has a roman numeral on it, THEN you would consider the others as implied roman numeral pages. Oftentimes material like this is the type of text that each print page begins on a new braille page. If that is the case here, we would suggest not confusing things by adding in the rows of dots 36. If this is NOT the case here, then the rows of dots 36 would be appropriate.
For the A1, B1 situation, the blank back sides do not have to be accounted for. Just use A1, aA1, etc and then switch to B1.
Cindi