What years were they born & when were they last seen on census'?
The other thing is, you could leave the surname blank for females (incase married) & insert their maiden name in "Other name" option?
I need to look at SP tomorrow to find out what you mean as I haven't tried what you're explaining so I'm still thinking in "old site" terms.
You could open a thread with your queries for help though.
I'm off to bed for now.
Annie
I'll give you an example Annie

Mary Murray, born around 1844, last seen in the 1851 census in Ecclefechan (parish of Hoddom, county of Dumfriesshire). I can't find a death for her in Ecclefechan so I'm lead to believe she's gone to live elsewhere (I've bought every death for a Murray in Hoddom so she's either somewhere else or died in those 4 years before civil registration). I don't know her death year, death age or death parish, but at least I know her birth year. So before I could include that in the search and get deaths for Mary Murrays of the right age, but now without that I'm left with results of 100s of different ages. I've contacted them about it so hopefully it can be returned at some stage.
"Surname" and "other name" have always been interchangeable unfortunately, so that wouldn't help. Once all the mother's maiden names have been transcribed, I don't think there will be such a thing as an elusive death in Scotland.