Is it possible to add a Property (Double value) or Constant to the Shared

TIM JONES

No
while these appear to be “properties” they are more like “project settings” that get used when the project is compiled and some may get baked into your exe, or its plist. Major Minor and bug version for instance

But there is no way to add to this set as anything users add needs to be part of a class, like App, or Module