Sure! Feel free to add more description or do scenes to/with any of the changes/characters in any of the episodes. For example if you wanted to add a link to the airport episode and follow any of the people Susan and Roger saw on their way to Aruba, that would be great.
Or, add anything that's entirely new! The Infamous Five have a very large canvas to paint on as it were. I can't tell every story, so feel free to add your own!
The I5 is an open highway anyone can ride on. :-)