Please see:
http://Help.KVSTool.com/#Q1

Does this mean that we can't SDC onto routings, even though seats are available in the fare class -- it has to be a valid fare?

Is there any way to do what most of us would want-- search for available seats by bucket?

(Note on other searches, inventory seems to pop up from 0 ...)

UPDATE:
As a small update here, the searches I performed regarded an afternoon when 6,000 Salesforce employees were leaving Atlanta, mostly for the Bay Area (my destination that day); and KVS direct support was quick, responsive to level of incredible.