This idea has been merged into another idea. To comment or vote on this idea, please visit FORTE-I-96 Allow for Custom Depths for Timber Sizing.
It would be really nice if you could unlock the "custom depth" field for commodity lumber. For the modification of the structure of existing buildings, it is sometimes needed to deal with unusual joist size. I have a project right now where the existing structure is all made with 2 1/4'' x 9" joists.
Simply unlocking this field would have made my life easier. Probably very easy from a software programming standpoint