It would be convenient for lat and long fields to accept and parse coordinate pairs, instead of scalar values only. This would allow the user to fill a site's coodinates from other applications with a single copy/paste operation.
I’ll add the request as a ticket, but I can’t say when we’ll get around to it. For now you may just want to paste the names, coords in a CSV file and import all of the sites in one hit. Alternatively, if you have them in Google Earth you can copy/paste markers directly into LINKPlanner as sites.