Yes. You may open existing files in Integration Designer APEX in order to reuse the UI in a new project. By ‘tagging’ the buttons on your existing UI programming, you may now merge into any APEX project, and the template will auto-program. The control programming will not be imported from .rti files.
Yes. In addition to the included, auto-programmed templates, you may create your own pages, tag them, and still utilize the powerful features provided by APEX. You may modify the template pages as desired, or take advantage of pre-tagged third party templates.