save as variable name, then flatten, then email

Saving the file under a specific name requires installing a script on the local machine of each user.

Flattening the file requires all the users to have Acrobat, not just the free Reader.

Also, it's not clear from your description whether you want to mail the form, or to disable the Submit button (or both)...

Depending on the type of workflow that you want to employ it is possible with JavaScript.

You can create an button with  mouse-up action and employ a similar script to the different methods discussed in this tutorial by Thom Parker: How to Save a PDF with Acrobat JavaScript 

The tutorial above explains and discuss all the considerations needed to change file name and handlig directory paths conventions. It also discusses how to save to a postscript file to completely flatten and remove PDF features from the document during the  Save As procedure. You'll need to add  a script to  make the  button field not visible before it is saved as a postscript.

You'll also need to add an emailing script to that action button which is really not that hard.

You can do that part like this:

//leaving the From and To addresses empty with a space between the quotes will open up the address book automatically

var cFromAddr = " ";
var cToAddr = " ";

//or spcify the From and To email addresses to automate this workflow

var cFromAddr = "myemail@company.com";
var cToAddr = this.getField("EmailAddress").value;




// concatenate your date field and the Form fieldnames to the message in the subject line to appear as the filename sent in this attachment

var cSubLine = "Please see attached file" + " for the End of Month Gross Profit Report, " + this.getField("myFormName").value + " - " +  this.getField("myFormDateField").value;
var cBody = "You can customize your email mesage here."



//execute some actions , hide the button field and send email

this.getField("myButton").display = display.hidden;
this.mailDoc({bUI: true, cTo: cToAddr, cFromAddr: cFromAddr, cSubject: cSubLine, cMsg: cBody});