BUG REPORT: Add Item to the Inventory

Hi,
I have a problem in adding a new item to the inventory, the Javelin, because is completely missing from the Weapons List despite being a standard item from the rule book. The list is also missing many other common items found in the manual.
Trying to use the custom item generation does not help, because I cannot actually enter all the attributes needed (damage, type of damage, type of weapon, etc.) but only the name and a general description.
Thanks for your help,
Daniele