No. Once a salt analysis is entered, it will remain in the app until you delete it.
Simply go to the Configure Salts page and swipe the unused salt to the left and tap delete.
No, it's not possible. The only place the recipes are stored is on the users device. Fercalculator® has no access to them.
Yes. When exporting your recipe just include them with a CC or BCC at the sending email stage