I have completed the functionality for calling generators to grab the input variables from the generators they call. Now when you view a generator on the view_block page, all of the input variables from all of the generators it uses, including itself, should be a available to you.
One note:
If the calling generator happens to have an input variable with the same name as one that of the generators it uses has, the options in the calling generator will take precedence over the options in the called generator. So, for instance if you had a generator called [my_car] with a variable named "car" and the following options:
-Honda
-Ford
-Chevrolet
and [my_car] also happened to use a generator called [special_car] that a variable named "car" that had the following options:
-Ford
-Accord
-Dodge
you would only have the following options when viewing [my_car] on the view_block page:
-Honda
-Ford
-Chevrolet