A)
As you already mentioned its been talked about, so how about adding your comments to one of those threads...
B)
There nothing stopping you from changing the current 16-color pallet. goto alt+c and change ur color by right clicking
C)
It wouldn't be far fetched to allow you to change 1-6 independantly from 17~99. That would give you the extended colors on your own syste, but if anything the rgb idea would make other client uncompatable, not using []17~[]99
