I think it's more that the remjet is more suitable for MP use but it was easier to simply use a still emulsion .
Yes, although they also said that they had to make unspecified changes to the still ektachrome for Movie use. Likely some form of lubrication on the backing. Of course the whole project may have been to use up master rolls of ektachrome by selling it as a KWEL thing to Music Video producers. For a while they had a super 8 version of 64T until the 64T still film ran out.
Colour Negative for movie use is always with rem jet, they have probably been tempted to use it for B&W also but the Labs would have been forced to change their processors.
Charles MacDonald firstname.lastname@example.org
I still live just beyond the fringe in Stittsville