The problem is that there are so many of them. Plus a great many not shown on TCM, such as his annual "Football Thrills" sub-series. No clue why, except perhaps TCM thinks they are too "of their time" and nobody viewing would recognize the athletes featured?
All Smithies available now are extras with DVD feature films and I am sure you can count barely 20 as of now.
I also would like to see the Historical Mysteries and Passing Parade shorts that MGM put out in the thirties and forties with Carey Wilson and John Nesbitt narrating. Now that was a smaller series that could be released all at once, but how many other than us shorties geeks ever heard of them aside from their periodical TCM airings?