I don't believe the people at LimeWire intend to implement everything but the kitchen sink in their software. - And if they tried that, it would most definitely suck.

There is already really good software to burn CDs/DVDs, try looking at http://www.download.com

Also, don't confuse LimeWire with a regular media player, LimeWire's player is not really meant to compete against stand-alone media players, - try iTunes:
http://www.apple.com/itunes/download/

It is difficult to gather the top-10 downloads information in the client. And I for one wouldn't like LimeWire to keep track of what files the user downloads.
For file-sharing top-10 see here:
http://www.bigchampagne.com/