Lumia 1520 :: How To Save High-def Photo Only On Phone Camera

Just upgraded, recently, to a flash new 1520 and I absolutely love it! So big, clear and brilliant to use. However I have just discovered, this morning, that I cannot fix or set the camera function in one particular area.

I noticed that a 5mp photo gets saved along with a high-def photo when I use the Pro Cam - which I don't want to stop using because I love it - but when I went into the settings of it, I found that I cannot only keep the high-def photo alone, it is either the small res photo alone or the small and high def together and that's it, I cannot just save the high-def photo alone and if I delete the photo, they both delete.

Is there any way I can just save the high-def photo alone, by downloading an app of some sort? Would a photo file manager work? I just don't see the point in putting such a fabulous camera on a phone and having it automatically set with such odd options.