We are also talking about the same issue at our office. It seems funny, that we need to spent so much time on something that doesn’t have any influence on the LCA results 
Especially given that the standardformat for LCA-documentation in BR18 is optional.
Would it be possible to add all unclassified materials under some generic category, so that you don’t have to classify everything manually to create a report? Having a category in the report called “No classification code” is sufficient.
For those who would still want to use the classification, it would be nice, if you could click on the material type (rather than the material instance) and add a classification
In the same way, it would be nice to be able to do the same on building component type level. Then you have the general classifications, and you can add sub-classifications to materials as needed afterwards.
It would also be nice to have an easy way to see, whether a material/type has been classified yet.