It is standard to use a double whole note rest as a whole measure rest in 4/2 meter. This is possible in Finale at:
Document Options>Notes and Rests>Rest Characters>Default Measure Rest>Select?Symbol Selection no 227.
But this doesn't work for a piece that is not entirely in 4/2 meter and needs normal whole measure rests as well. For this reason, there needs to be an option make double whole note rests the default whole measure rest for 4/2 measures only.