@junjishimazaki maybe I am not understand what you are getting at, but you can remove apps that came with the iOS. I do this on all of our iPads through a configuration profile. Under Restrictions --> Apps --> Restrict Apps --> App usage. In the dropdown box I select "Some apps not allowed" and I type in what I want gone....if this does not remove them at the very least it hides from being used. As far as making this decision through application usage criteria I have no idea.
