As i'm a "retro computing"-addict (just one of my many addictions), i'd love to see that kind of feature embedded into MC.
But i believe it will be too much work (with not enough ROI) for JRiver to implement that kind of functionality, as there are soooo many formats, with different technical problems, etc.
One easy way to accomplish this kind of functionality would be to support or embed external plugins, like ModPlug or MikMod (there are lots of other open source player libraries). If MC would support WinAmp plugins (don't know if that's the case already), we could also use the available (sometimes not perfect, but still quite good) WinAmp plugins.
Another idea that comes to my mind is a possible cooperation with other software developers. For example, the DeliPlayer (
http://www.deliplayer.com is a _very_ good player for all kinds of "old" formats, but the UI sucks, and the programmers no longer seem to have the time to further develop the software. For me, it would be a dream to have the functionality of DeliPlayer embedded in an UI as good as MC's.