re: the link extension will not link user to email
Correct, if you are puttin Form on its own page using the shortcode, submissions will not link to the logged in user. It will add a new entry. To use Form and Link you have to follow the instructions in the documentation for configuration.
re: users will not be able to edit their profile using the widget
Correct, this is because entries submitted via your custom page will not link the user. The user must submit their entry using the internal page that the links resolve to.
re: add new profile link in widget needs to be redirected to my shortcode page
Sorry, this is not possible because any submission to a custom page is not supported and the entry will not be linked.
re: the edit form will contain the parent categories
Sorry, I do not understand this point. Could you clarify?
re: is there a way to either solve teh above or manually include (hardcode) only the one parent category in the autogenerated form page?
parent_category='n' to the
[connections] shortcode. It will be passed to Form and used to limit the category selection.
Hope that helps!