What a mess!
I'd have to agree. Sorry for getting your hopes up!
In the INT library, the roof members found in both the 'RoofMaker' folder and the 'Roof Construction' folder both have the LumberSize parameter which does actually display the correct length.
Unfortunately there are several other parameters that are not shared or named the same and so they cannot be used and scheduled together.
In fact some of the parameters found in the 'Roof Construction' members looks German based!
Although I understand that many library parts have been re-written for AC14, I suspect that these probably haven't. Perhaps this could be a job for Zsolt and his team to finally unify all the roof members between the various metric and imperial countries, and ensure the parameters are named the same so the scheduling works more reliably.