Well, Don, it seems very strange to me that you are importing unrelated individuals. That doesn't sound like a family tree to me. I think you would do better just to import the people where you have relationships. You could do that by importing a small GEDCOM file for each cluster.
After you import each one, look over the small unconnected tree that you have just added, and see if a blue "flag" pops up, to suggest that one of the people you added is in the Whole World Tree already. If the other relatives match, you could request a merge between the person you just added and the profile that was there already. This happened for me when I added my g-grandmother, Adelaide Sturt Henderson (Morphett) (Adelaide Sturt Henderson)
There she was in a branch of Morphett relatives. Those profiles matched the people my mother had told me about, so I requested a merge, and her manager agreed. I now have access to all those Morphetts, and they have access to all the Hendersons I have added.
Remember, Geni is for cooperating together on our research. I hope you will find that cooperation helpful in your work.
If you want to store information about unrelated people, why put them into family tree software. Why not just use the Contacts in your email program?
For the unrelated individuals, you may do better searching for them in Geni than just adding them.
Jim
PS. I have just noticed you are a Curator already, and here I am trying to tell you how Geni works! :-(