You should be able to remove the Select ALL by doing Copy * TO ... instead of Copy TO ...
For the WHENEXISTS problem, I think it would make sense to delete any existing collection before creating the new one. The Scrap Collection Toolbar has an example, on the "Clear Scrap[/b] button, but I think you just need to add this (with the dopusrt stuff) between the two CreateFolder commands:
Delete QUIET FILE="coll://FlatView-Cache/%str%"