Well I'm pretty sure I am correct on the 7.
There are a couple in the fjords, you get one or two in broken valley because I had no clue what they did at that time when I clicked on them as I saw no new options ever pop up.
There are a few to be found in your battle tower even before you go out and fight.
One in the chest behind the throne, one on the bed or table by the bed by Sassan and then one on the table out by the trainer.
So there is three right there that I remember for sure.
Don't remember exactly where the other ones were in the fjords and broken valley, Maxos temple was one or two maybe.
I do remember distinctly clicking on a few dragon skill books before I even got the battle tower as it always said you got a dragon skill point but I never saw anything. I was expecting a new set of dragon options to pop up in your skill list.
As for the keys
I looked all over those little rooms where I made the choices, good or evil choices I guess and could not find any keys Even went back and looked thru the rooms again after I got to the end and received my reward. Maybe because I gave up my skills and points and that meant I could not get the keys. No clue but there were no keys in those tiny rooms as there was no where but floor for them to be.
I'll just forget about going back to that moving platform chamber in the lava chamber to get that key for that other chest if I need to do those platforms over. I broke one mouse by slamming it down and nearly put my fist thru my monitor on those dang things. Hate those things as you have no control over your jumps, it's just a set distance and that is it and I always over jump.