Best way to have a repository of pre-configured options but also allow users to add/edit

Well, the best design would be to have a table with a list of standard campaign questions, possibly group with tags in a multi select field.

Then, when you create a survey record either by a pipeline or an a button push, you could import the standard survey questions into the particular survey you just initiated. That way you can control which questions are associated with a survey and they could be selected from a library of Choices.

When I have done these type of surveys in the past, I have a parent child relationship. One Campaign has many Campaign Questionnaires, and one Campaign Questionnaire  has many Questionnaire Questions.   When the Campaign is set up, presumably you know the type of Questions which need to be asked.  So that selection would flow down to the Campaign Questionnaire.

Then there will be a table of Standard Questions.

Then when the Campaign Questionnaire is created a Pipeline would fire to search for Standard Questions which are tagged in say a multi select field that include the type needed by the Campaign.   The the result of that search would either be created in a for each loop, or more effiently with a bulk upsert (if there are going to be a lot of questions, say like more than 20 ish) or else try out the new Import to Quickbase step which should be perfect for this situation.

Now this presumes that the format of the questions is always the same, for example, a question and then a free form text box. If you have other question types, which have a yes/no answer or some kind of rating answer then what I have done in the past is to have say three question types and then that would be selected on the standard question as to what question type it is and then when they're imported across as questionnaire questions, form rules will show and hide the appropriate fields.

 Feel free to post back if you have any questions. 

.... you can also have a standard question come into the child record and then a form rule fire to copy to an editable text field