For the forms and multiple email addresses:
Any old formmailer including the 2 in your cpanel should do the trick. You'd just change the recipient from:
Code:
<input type="hidden" name="recipient" value="you@yourdomain.com">
to
Code:
<input type="hidden" name="recipient" value="<A href="mailto:email1@domain.com,email2@domain.com,email3@domain.com">[/code">email1@domain.com,email2@domain.com,email3@domain.com">
You can see source code to a completed (and basic) web based submission form using formmail clone at the link below.
Web Based Email Form Tutorial
I am sure cgi email also found in cPanel can do this as well however it is a more advanced script. That or any other formmailer script you find on the Internet in Perl or PHP should work fine for this. I'd use cpanel's though as they are automagically updated when security issues arise.
As to the fantastico scripts, each script has an official website and support community or support channels, most of the scripts have some form of documentation available on what the script is, how to use it, etc on the script publisher's website.