Request for registration form hook
view_my_accounthook - for account page
view_users_formhook - for user edit page
view_account_left_bottomhook - for user profile page
But it misses a hook for registration form!
That is if I need to add some new fields (let's skip why I can't use custom fields) I won't be able to add them to registration form (custom fields are supported for it). That's I believe another hook should be added to registration form.
P.S. I attached patch for adding such hook.