In Sitefinity 7 Admin I can see my new widget template in the area: "Documents and Files" and applied to: Documents-list
We brought this up in May 2011 (yes 3 years ago). So it should not take much longer till this gets fixed :-)
More on the matter here
How about starting to work on this when you all come back fresh and rested from your days off.
I was wrong :-) This problem dates back to Feb. 2011