I am using a very simple form to provide general information and then allow the user to either enter their email address and click submit (just like the sample mailing list form), or allow them to "click here" which is a hyperlink to a mailto - unfortunately I have got this to open up the default mail server, but cannot seem to find a way to add a subject line to the hyperlink without adobe complaining this is no longer a valid email format - any ideas?
Sorry we do not support passing extra parameters in the mailto link. You can only use an email address.
If you want us to support this feature you can create a new idea here : http://forums.adobe.com/community/formscentral?view=idea
Just click on the "Create an Idea" in the top right corner Action menu.