Best Bets Commerce Category

Hi Guys,

EPiServer.Find 13.2.1
EPiServer.Find.Cms 13.2.1
EPiServer.Find.Commerce 11.1.1

Is it possible to select a commerce catalog node as the content for a Best Bet? My nodes appear greyed out.

Looks like this used to be possible from some old posts in google?

Also is it possible to apply best bets to a FIND query via code? i.e. would I be able to create a block that allows a user to select a catalog node, retrieve all products within that node and then somehow add these as the best bests for my query?

Thanks in advance
Mark