I approached the developer, Ben Zotto, about my desire to use
Penultimate for storyboarding. The app then offered a selection of
three paper styles; plain, lined, and graph. Rather than
myopically suggesting he add storyboarding templates, a rather
niche use case, I suggested that it might be of general interest
to his users to allow custom papers. I must not have been the only
one thinking this, because just this May, Ben released a
Penultimate 3.0 with exactly that feature. He even used a film
storyboard as his example.
Good way to think about making feature requests.