Yep this is a problem. I also don't like how I have to press 'Save' to store the contact. Too often have I entered in all the information only to hit the Home button and lose the entire contact.

Also in Mail, the 'Trash' button is at the bottom directly over the Home button. Sometimes I try to push the Home button and slightly miss, deleting the message I was reading. In the worst cases, I'll hit 'Trash' and then the Home button, not even realizing that I have deleted a message. I wish I could just disable the 'Trash' button as I use Gmail and don't need it.