Process and Task Form editing in jBPM Designer is a breeze with many cool features such as:
- Customizable Form Widgets
- Live Preview
- Auto-completion on Process Variables, Globals, Data Objects, Data Inputs/Outputs
- HTML element completion
- Search and Search/Replace
- etc.
In the video below we show off these features and demo the creation of both an HTML and a Mobile process form all using the In-Line Process and Task Form editing ability in jBPM Designer. These features allow you not to be tied to a particular set of form elements and web technologies which you are allowed to use, but give you the ability to decide how your forms should be defined and coded.
Enjoy 
Absolutely wicked addition to the designer, well done!
is it possible to use JSF tags over here
Yes you can if your human task service impl knows how to parse them. jBPM Console expects freemarker templates (ftl) which include basic html currently.