If I remember correctly - because it's the kind of thing I did automatically, like dialling a phone number - but I used to select the births from 1700 and something to the present, then within that I would narrow down the years to, say, a block of five years, and then search by surname. A list of results would appear and on clicking the first name on the list, all the quarters would be indicated. This gave an alphabetical list for e.g. Q1 1950, then Q2 1950 etc. If the names continued on to a new original image, one simply found a name further down the alphabetical list and clicked on that to obtain the rest of the births. In that way I could be sure that I had seen every birth on the original images.
BTW, it does seem possible to obtain a list of births by mother's maiden name by inserting the maiden name as a keyword optional extra, likewise by inserting spouse's name in the same box one can obtain marriages between those two surnames, though whether these lists are as complete (or incomplete!) as they were, I don't know.
