Thank you for your questions, Mark.
I am making the links manually in Outline View. You are right, of course, that $LinksTo is a user attribute. (I also made a $LinksFrom attribute.)
I am not sure I understand your idea about appending the desired link type value to the $LinksTo attribute. That attribute is currently populated by using a Rule:
As you can see, I specify which Link Types can populate my user attributes. The exact number of types may change in time.
Notes may indeed link to more than one other note.
What I would like is use code in the template to present the type of link type somehow. So just as I can use code to output what the $Name of the link in my template, I would like it to be able to use code to output the Link Type. If the note used more than one other note, I would like each one to be outputted separately. Something like:
Links To: Using TBX for notes (exception), How to use this file (example), Reading methods (response).