tow questions and a bug report

[tianfan007]

first question: in line 199 of the source code，there is a commentary"don't drag container itself". if I delete this "if" judgment,are there have hidden dangers?
second question:the "direction" default is vertical,another option is horizontal. why the Dragula is necessary must to choose one of them.If I want to triger the drag actions freely,how to do it.

if I drag a form element,just like "button","select","textarea" and so on ,an error occurred:Duplicate form field id in the same form