I could add records to a table by clicking the "add new" button in the main window, though it seems there is no way, by now, to modify a record. For contacting the Author, you can see his home page in http://home.cfl.rr.com/genecash/index.html .
At present, however, I feel more comfortable with a spreadsheet table in Gnumeric, which can be imported and exported with ease.