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I think you're right, in the next day I gave this thought up ...
I'm in China, rooted devices are more than unrooted ones around me, and rooting seems to be quite easy for most popular devices , so I might be gonna treat users differently
anyway, thank you for responding me!
I don't know how you would be able to do it without root access. You can't effectively use a file explorer to even find data, otherwise. I'm not an app developer, so I may be wrong. Good luck in your efforts, let us know if you succeed. I suggest exploring this over at http://www.xda-developers.com/ where there are a lot of bright people that know more than I ever will about Android.