Form Inheritance is one of the advanced features in Delphi. I've never used it much myself, but I know without it uniGUI can not be considered as complete. Some users asked about it and I decided to speed up its implementation.Currently it is implemented and being tested.
Procedure to create a new Inherited Form is a bit different than Delphi. You must use the newly added uniGUI Inherited Form function in the Wizard to create a new Inherited Form. It will display a list of available forms in your project. By simply selecting a Form from this list a new Inherited Form will be created. This feature will be available in next version 0.71.0