Welcome to the forums.
I don't see why you put this in the feedback section, but I'll attempt to help anyway.
My question to would be this: why? It just doesn't really make much sense as to why you'd want to do such a thing. The enter key already has a meaning when inside a form element and that is to submit the form. On the same note, the tab key already has a meaning that most users are aware of: to navigate through the form elements.