Re: [development] Hello from another developer/Want to add some features

* Support for form fields to be rendered as either editable or view only.

#attributes => array('readonly' => 'readonly') . Or you can intrdouce a #type => view_only which would expand any element to a hidden and a markup. None of these require any core change.

* Support for datetime and time fields.

I thought we have #type => date now.

* Disabling changes to usernames and passwords of administrative users by users having administer users permission.

This is not my expertise. Forms are :) Regards NK