Appreciate the feedback, unfortunately it's very unlikely we'd be able to look at this.
Why not try concrete5 5.7, it's the focus of the majority of add-on developers now.

Thanks for the response. I use quite a large number of addons that won't be converted in the near future so I don't think I'll be using 5.7 for and new sites in the next a year or two. If I do I'll take a closer look at this addon.

Cheers,
Mike