I will allow all those requests,
No to the elephant in the room or background skills.
I will however allow you to gain bonus Feats and skills as rewards between mythic tiers. This might reduce the pain of no free stuff. The Elephant in the Room was calculated with the idea that you don't get a free +6 to Dex, that you do would makes a lot of choices too weak if you get free Feats of that nature.