IssueTracker

There is already a generic issue request to be able to modify google Forms.  Here are some suggestions for what an API might be able to:

The new forms product breaks the linkage between Spreadsheets and Forms, which makes the replication of spreadsheets with formula-dependencies on form data impossible.  This is a major problem for power users (enterprise, K12).

Unless the Forms team is planning on restoring the linkage soon, a programmatic way to copy forms and spreadsheets as a connected object is very much needed.

This routine might look something like this:

var form = FormsApp.getFormById("gsfdsfgd").getConnectedForm(); //return form object
var ss = DocsList.openById("gsfdsfgd");
var mappingObject = ss.getFormMappings(); //return an immutable mapping of form questions to columns
var formCopy = form.makeCopy("new form name");  
var ssCopy = ss.makeCopy("new SS name");
ssCopy.connectToForm(formCopy, mappingObject);  //connect SS to Form, map all relationships

--OR--

this...

var form = DocsList.getFileById("gsfdsfgddsfdsa");
var ss = DocsList.openById("gsfdsfgdasddsfdsa").getConnectedSpreadsheet();  
var mappingObject = form.getFormMappings(); //return an immutable mapping of form questions to SS columns
var formCopy = form.makeCopy("new form name");  
var ssCopy = ss.makeCopy("new SS name");
form.connectToSpreadsheet(formCopy, mappingObject);  //connect Form to SS, map all relationships (form to sheet, questions to columns, etc.)

Here is a sketch of what the Forms API might need (not that I have any experience with API design;)

FormsApp.getFormById("gsfdsfgd");
SpreadsheetApp.getConnectedForms();  (leave open to programmatically creating many to one relationships)
FormsApp.getConnectedSpreadsheet();
form.getQuestions() - return an array of question item objects
form.getMappings(); - return an object that somehow provides the sheet id associated with the form and all column ids associated with questions
question.getText() - return text of question.
question.setText() - set text...
question.setHTML() - YAY!
question.getType()
FormsApp.QUESTIONTYPE.LISTBOX.setItems() - allow an array of values to be dynamically assigned to question types where lists are concerned  (This is HUGELY important)

question.getMapping() - return an object that allows us to know which sheet and column correspond to a given
question.setMapping()

For robustness, many of these methods would require an immutable column ID can be understood in the context of the Spreadsheet object...Presently, if one drags a form-connected column around, the form somehow "knows" that the new data should go into the same column, so there must be some underlying immutability to the column-form relationship that is not order-dependent.  I'm assuming this could be exposed via an API.

form.getMappings() - return an array of objects like the one described above
form.setMappings() - set the mappings of form questions to column Ids
form.addQuestion()
form.deleteQuestion()

etc.

This remains an incomplete sketch....

Others with better experience in API design, please chime in!