bim.aero allows adding quantities and properties to BIM elements, but also, to all type of entities in your model (the objects, the layers, …).
1) Only quantities and properties of single value are allowed at the time.
2) You can add standard the quantities and properties from IFC 4 to BIM entities of your model. These standard catalogs are suggested depending of types of the selected BIM entities.
3) You can create your own dictionaries and quantity or property templates.
4) All the properties and quantities, including yours, that are attached to a BIM entities, are exported with this entity (IFC format requires PREMIUM PACK).