Adding the ability to put passwords on individual forms/tables would be really useful for database administrators. This way you can give users different access to the database. Reproducible: Always
There is also related wish https://bugs.kde.org/show_bug.cgi?id=300625 "Wish: Add password protecting to Kexi database files".
Design page would be at: https://community.kde.org/Kexi/Security/Add_password_protecting_to_individual_objects_in_Kexi_database_file