It would be handy to define a shared query whose filter
arguments automatically specify the currently logged-in
user.

This could be a special case that only works for links
or multilinks targeting the "user" class.

Filtering in those fields by a magic identifier such as
"." would be interpreted to mean the currently
logged-in user.  ("." matches the special "right now"
date syntax.)

Example uses:
  "My Issues" filters on "creator=."
  "My Assignments" filters on "assignedto=."
  "Closed by me" filters on "actor=."

Thus the admin or template designer could define and
document such queries in one place, to work for everyone.