On old inscriptions from the 1700's I have seen for example names written as Grohse. The spelling is not consistend and it depends on the time period the names are from. If you are looking at names from 1900 and later there is the ss and the ß, but hs in combination is no longer used. When it looks like a hs I usually use ss. I know they are not in the drop down list, but the drop down list is not accurate. On the USHMM Munich project for instance, towns are listed without the special characters, München shows up as Munchen and so on. I only use the list as a rough guide.
At present I am reviewing the USHMM Munich project as no one else is doing it. Then I will return keying and reviewing the Lübeck project and see it through to the end.