Hello Paul,
Unfortunately, I think both versions of the plugin suffer from the same problem.
I must admit that despite having coded one of them I am certainly not an Examview specialist (I don't use it myself, I am just interested in formats conversion and helping other teachers) but as I undeerstand it Examview "short answers" question exported in Blackboard files don't contain any model response so they can't be converted to Moodle short answers or numerical questions that are automatically graded, so the only solution is to convert them to essay questions.
But after all maybe I am wrong so if you post a (small) example file with some questions you want to be converted into numerical ones, I can have a look. But if there is no right answer in each question I don't see what I can do to make them numerical.