Default [Q] disable wallpaper changing?

Today I installed an app locker (perfect app locker) so I could protect some apps from nosy people (gmail, drive, gallery, etc). Which does what it's supposed to do... then i noticed something. If open the wallpaper settings (holding down on home screen) I can access to 'recent' pictures, and my drive, dropbox, astro file manager, downloads, gallery. that means - in a way bypassing the protection. Is there an app that could actually be able to disable that?