Well, a lot of times, I see myself needing just a simple list (list of
titles, list of id's to pass to in_bulk(), etc.)  If we just had a
function that returned tuples, then a list comprehension would still
have to be used to make a list from the singleton tuples when wanting a
for loop or for passing to in_bulk().

With adding both methods, we then have a method for returning each of
the main python data structures.  As for valuelist(), instead of being
able to only pass a single parameter, it might be cool to make a zip'ed
list of values, i.e.

[a1, b1, a2, b2, ...]