The Options tab of the Table Editor shows the items as can be seen below.
InterBase Table Options
Editing the primary key name is only useful for tables that don't have one yet.
The External file checkbox and edit box will be checked and enabled when the table is defined as an external table. Enter the filename in the edit box as it is seen on the server.
Depending on your version of InterBase, the temporary table box is enabled or not (InterBase 7.5 and up). The drop down box lists the on commit actions that are available.