[Elecraft] K60XV functionality for transverters

[w2bvh]

I must be dense or something.
Even after an explanation of the K60XV's functionality from Scott at 
Elecraft I still don't understand what extra features you get with it 
for transverter operation. It's evidently optional when using an XVnnn 
transverter and a KIO2. But does it provide any added capability in that 
sort of setup ? 

Thanks in advance for any clues.

73,
Lenny W2BVH