Wow, historic thread.

Doesn't this somewhat exist already in the multiple mile spend options in the FC account windows?
The reward flights option lets you look for G,P and T
The upgrade/companion flights option lets you specify the rest of the fare buckets not readily available through the main booking tool - i.e the ones you would want to upgrade from..
Granted there are a total of three places to look and it would be easier with an all in one dashboard for those fliers (

) who know exactly what they are looking for. This is VS though people, IT system simplicity and consistency has never been one of their strong points ii)
The thread made for some interesting reading though, thanks for digging this out sealink y)