pause-submission.js

var myCustomController = Marionette.Object.extend({

    initialize: function() {
      // ...
      Backbone.Radio.channel( 'form-' + formID ).reply( 'maybe:submit', this.beforeSubmit, this, formID );
    },

    beforeSubmit: function( formID ) {

        var formModel = nfRadio.channel( 'app' ).request( 'get:form', formID );

        if( formModel.getExtra( 'my_restart_flag' ) ) return true;

        this.otherProcessing( formModel );

        // Halt form submission.
        return false;
    },

    otherProcessing: function( formModel ) {
      
      // Set re-start flag
      nfRadio.channel( 'form-' + this.formModel.get( 'id' ) ).request( 'add:extra', 'my_restart_flag', true );

      
      // Re-start submission.
      nfRadio.channel( 'form-' + formModel.get( 'id' ) ).request( 'submit', formModel );
    },

});

jQuery( document ).ready( function( $ ) {
    new myCustomController();
});

Thanks for your work!

The above JS didn't work for me.

The updated code below did.

var myCustomController = Marionette.Object.extend({

    initialize: function() {
      Backbone.Radio.channel( 'form-' + form.id ).reply( 'maybe:submit', this.beforeSubmit, this, form.id );
    },

    beforeSubmit: function( formModel ) {

        if( formModel.getExtra( 'my_restart_flag' ) ) return true;

        this.otherProcessing( formModel );

        // Halt form submission.
        return false;
    },

    otherProcessing: function( formModel ) {

      // Set re-start flag
      nfRadio.channel( 'form-' + formModel.get( 'id' ) ).request( 'add:extra', 'my_restart_flag', true );


      // Re-start submission.
      nfRadio.channel( 'form-' + formModel.get( 'id' ) ).request( 'submit', formModel );
    },

});

jQuery( document ).ready( function( $ ) {
    new myCustomController();
});