I am using WP v3.5.1 with FSCF v188.8.131.52 and with Contact Form DB v2.6
Under Plugins choose FS Form Options.
Create a new form (with a new/unique database name from Contact Form DB).
Scroll down to Data Export.
There are then three textarea boxes.. one for Data Export Fields To Ignore, one for Data Export Fields To Rename and one for Data Export Key Value Pairs To Add.
So under the third one (Data Export Key Value Pairs To Add) if I add something like this:
then it will succesfully add "hi" to the database under the address2 column.
Now choose DELETE ALL THIS FORMS RECORDS and try again, but leave it blank after the equals sign like this:
then it will not get added to the database.