Request for possible co-maintainance

Hi, I had to recreate this module for a project, as it didn't fullfill all the needs we had.
It offers the same features, but takes quite a different approach.

Main differences are:

• Built against webform 7.x-4.x
• Stores per-component settings in the extra array, avoids having to store a variable for each.
• Most notably, it uses AJAX FAPI, which leads to
  • No need for an external library
  • Management of 'required' fields
  • No need for 'nested' fieldset, you just tick the box on a parent fieldset

It provides also a couple of tiny additional features : optional 'remove' button, configurable text for add/remove buttons, setting the initial number of children to display.

Instead of creating a duplicate module, I'd rather have it integrated here as 7.x-2.x branch and co-maintain it. You can find the code at https://www.drupal.org/sandbox/bellesmanieres/2473059 if you want to review or test it.
What do you think ?