What story would you prefer me to fidget with while I work on finishing "Readings"?
And furthermore!
Stories not on the list are not there because their characters aren't speaking to me at the moment.
Both of the Doctor Who crossovers are, in my mind, in the universe of "An Antique Roman", so they're both a bit Giles/Ethan shippy. Though it would be amusing to comment on the Nine/Rose age gap from the perspective of the Giles/Buffy gap.