I notice the Skritter Japanese App does not ask me to write some of the kanji on my lists. Is there a setting that allows you to push it to ask for the writing of all kanji on the list? If not, is it possible to get this feature?

It sounds like you might not have the "Rare Kanji" option enabled-- words that are usually written in kana are marked as rare, so you won't see the writing prompt for these words unless the option is enabled. (You can toggle this setting from Settings>Vocab).

Also, you might try the "Study All Kanji in Lists" feature before resorting to the "Study Rare Kanji" feature.

Is that the "Study optional kanji" box in the app? Or is it somewhere else?

@nick: Good point!

@EMFidler: It's the "Non-Required Kanji" option, right below the "Rare Kanji" option.