I have been back into DM after a short break away from it's use. I have found that text now appears along the center line referencing that the width, depth, or shape of the duct has been locked. This is a great new feature. However, I feel that one of the most important features that could be shown as locked is that of the CFM. In a quick duct sizing and CFM check, by locking the CFM of the end duct in the various branch strings, one can size and determine very quickly how a system is going to be. It would be beneficial to be able to see if the CFM has been locked as well as the W, D, and S.