Hi,
My sons (8 and 10 years old, but very interested

) are learning more about the Mint and therefore often carried out settings that often can not be restored. It is possible to set restrictions with which they can not, for example theme, wallpaper, or other settings change (so, as for example, when starting the Synaptic)? If so, how do you set it up? I'm an average user, but I am not afraid of the terminal is used.
Sorry for my english!
An old Lion.