Another proposal: link rules.
A link rule is an action that runs periodically. Link rules may access the facets of the link just as note rules access attributes of the note; link facets use % where attributes use $. Link rules may also access note attributes. For example:
$MyString(%source) = %comment
or
%comment = "Linking "+$Name(%source)
This would be another way to move data from links to notes, and from notes to links.