Debate on timing of fold-thrust development. Manby and Lyberis in three different articles propose an Upper Cretaceous age, prior to the dextral separation of the Barents Shelf and Greenland. They also suggest a minimum of 80 km of shortening. Tertiary foreland sedimentation history consistent with Tertiary deformation. Are more complicated scenarios, ones that even include minor sinistral movement.
Main point is that fairly complicated history possible, but dextral transpression dominant.
Description of major Tertiary tectonic elements. St. Jonsfjorden example. BFZ and reactivation of a terrane boundary. Lomfjorden Carboniferous and Tertiary reactivation of a large basement syncline. If a strike-slip component it is arguably sinistral.