In my configuration of Autodesk inventor 2014, there is clearly room for at least 4 more "recent documents" in the inventor dropdown with it set to small icons.
It would be nice to either 1) have the option to change the quantity of recent documents or 2) have it auto fill the remaining drop down space without extending the size of the total drop-down box (the actual goal).
It's been on the forums before:
http://forums.autodesk.com/t5/Inventor-General/Increase-the-number-of-Recent-Documents/td-p/2951276
http://forums.autodesk.com/t5/Inventor-General/More-items-in-the-recent-docs-list/m-p/2793060