I do have plans for writing my own version of BTTF4. I think it should take place in 1925, which is 30 years before 1955 - and Arthur could conceivably be seventeen, and bullied by Jiff Tannen of that era. Also, five year old Emmett will make an appearence in the story. I'll use the rules listed
here for my BTTF4 story.
On a side note, I have figured out the lineage on the Tannen lineage from Buford to Griff:
Buford -> Tiff* -> Jiff* -> Biff -> Cliff -> Griff
That should cover all the -iff names. :)
* Tiff (Tiffany Gertrude Tannen) is the female Tannen who had a pair of twins (Jiff and Jill) out of wedlock, so the children carry on the Tannen name. Jill is the sweet and soft-spoken twin of the two - and she has the hots for Marty. This makes Jiff angry with Marty. TGT, ashamed of how her son turned out, eventually decides to go by her middle name, Gertrude.