It would be helpful if some of the BOM (Bill of Materials) tab in Item Master were available in Project Explorer. Mainly the ability to add the "Quantity" Field. This will allow someone who does not have Inventor or want to open an assembly to know how many of a certain object is used in an assembly. Currently you can just see that a part is used in an assembly in Project Explorer but you have no idea as to how many are in the model without opening the assembly.
Many times an Item Master record has not been created until the Project Explorer file has been released. This adds a delay in being able to purchase parts that have long lead times or may be difficult to source.