[Koha] Shelving control number

Hi all, I have a question on how you deal in Koha with shelving control number (items.stack, default tag 952t). Since this field is a tinyint(1), it should be between -128 and 127. How did you resolve situations where e.g. 160 small books are on one shelf? *If* the field would not have been signed, we could at least have gone up to 255 books per shelf. Any comments are welcome! Thanks. Marcel de Rooy