you could use an external php program to write a new or updated data.file. the data.file can be manipulated outside of the store manager. but it seems like a bit of redundancy. you could buy the multimanager addon and assign user names and passwords to multiple users and limit what they see and what they can do.
if you write a php script, for example, to allow someone to add, remove or edit products you must protect that script somehow, hence the redundancy.
you can use userfields to link to like kind items. you can also create custom ppinc files per category so that the qty box is hidden where appropriate and add the qty box for the individual options where needed.
there are numerous ways to approach your needs and i'm sure agoracart can do everything you've outlined so far.
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