I understand this film is color balanced for tungsten light, but at ISO 64 it's almost worthless for indoor shots if moving supeople are involved. The exposure times you get at reasonable apertures are too long even if you point construction lights directly at the subjects from close range. Flashes are obviously not an option since they spit out day light balanced light. For still objects it may be easier to mess around with color correction filters. Grain size of 64T is comparable to modern daylight balanced ISO 400 slide film.
There must be more than fringe use since Fuji even introduced a new emulsion some years ago. So please tell me: what is 64T film actually used for?