Responsive Mortgage Calculator Pro is under active development with new features being added. RMC Pro is extensible through the WordPress actions and filters APIs, and custom APIs, making it possible for developers to add new elements to the Interface, new Processors, and new Calculations. It’s gotten so much easier to create add-on plugins and share calculator settings.
Here are some resources to get you started.
Using exported calculator settings to create your own custom presets is super easy. Get the RMC Pro Preset example plugin on Github.
Improvements, bug fixes, and miscellanea can be found in RMC Pro Changelog.