I have been trying to run FAST search for my content and standard SharePoint Search for people search. I know FAST can do people search, but a third party application is forcing my hand.
I believe I have run into a wall as it appears that the OOTB search web parts do not allow you to pick one search over the other and the Configure Service Application Associations only lets you pick down to the granularity of the service application.
Incidentally, if I do not have FAST Search Query Service Application set as default in my Configure Service Application Associations, my FAST Search Center will return an error "The search request was unable to connect to the Search Service"
Oh well, time to give up and move on.