item_inv_in callback does not have enough functionality

[Sasabmeg]

void item_inv_in(ItemCl& item) - gets triggered when dropping partial amo stack or countable items as well.
I need callback, in a way that also gives back the count of items droppped if countable and I need to be able to identify if those have been removed from inventory or put in.

Additional note:
void item_inv_out(ItemCl& item) - works on dropall only
void item_drop(ItemCl& item) - works on item destroy only (science an item)