Shortcodes that are created based on user input information

You could use it like

[form id="abc123"]

where the value of id is the meta_value. You could generate the shortcode so the user can easily copy/paste it into the editor. Or even have a custom made button in the editor to insert it.

You can check how it’s done in other plugins like Contact Form 7:

[contact-form-7 id="50" title="My form"]

http://wordpress.org/extend/plugins/contact-form-7/screenshots/

and Fast Secure Contact Form:

[si-contact-form form='1'] 

http://wordpress.org/extend/plugins/si-contact-form/screenshots/