Is there a way to show the same pre-filled area also during profile edit?
You mean to have the default registration value also apply to profile edit? There is no such parameter. You'll have to use CB Auto Actions using a field actions with before profile edit display and change the value of the field if is empty.
Also when I set "Show title field" to "no" it still show during registration, how can I hide it in registration too?
To remove a title entirely you'll need to set the title to _UE_BLANK. Otherwise use CSS to remove specifically from registration.