In my opinion, such a list would only make the gap between famous and unknown authors wider.
Besides, how do you determine who is the best mapper ? Who do you determine which map is the best one ? That's a matter of taste. A big part of TMX players enjoy playing mini tracks with ugly block mixing. Does it make these tracks the best ones ?
Also, many awards are friendly. MrDvD is a good example of this (no offense dude, if you ever read this). I've tried some of his tracks with much attention. Most of them often get a lot of awards and end in the botw. I know it's subjective, but i found most of them pointless. They were not bad, but not funny either. None brought anything interesting or original, but they still got far more awards than other tracks i've found pleasant.
Most people award tracks not only because they like them, but also and mainly because they are friendly with their author. I too must admit that i'm not only awarding tracks because i enjoyed them, but also because i think their author needs more attention than they get. All that would make such a list totally unsignificant.
If a list has to be added, it would be, in my opinion, a list of authors who make original tracks, tracks that are really special and different, innovative and refreshing ones.