+ 1 for Dynamic Range support.
Once the implementation is there, if a new, better algorithm, providing more precise calculation of DR appears, then we can maybe just replace the dll (as in case with Replay Gain)?
There were complaints about initial algorithm of Replay Gain as well, but nevertheless it became a standard in few years.
Nowadays we can use different algorithms and implementations for evaluating of the loudness, but tags are standardized, values are compatible (after adding some offset), so migration to the prsent-day RG algorithms is smooth.
I think we have almost the same situation with DR. The tags are (de facto) standardized, there is a big library with DR results of different album releases (I thing the access is not free, though), there is a plugin for FB (so it can be used as a tester for compatibility
), and I think once the DR became wide spread, new algorithms will appear soon.