Extending the LOOP macro

I was just playing arround with clsql's extended loop macro
and realized that the extension basically performs a 'select'
and collects the result into a temporary result set and then iterates
over it. Hmmm. I somehow expected such an iteration to expand into
an equivalent sql _cursor_ operation. i.e. something like the following
pseudo-code:

 Loop init:

   (optional) BEGIN TRANSACTION
   DECLARE a cursor for the given select statement 
   OPEN the cursor
    
 Loop body:

   FETCH next row from cursor and bind it to the
   loop variables.

 Loop termination:

   CLOSE cursor
   (optional) end transaction.

This does make a difference in performance when the loop contains
WHILE/REPEAT or RETURN clauses since the current version fetches
all results before evaluating and conditions.

Are there any plans of supporting cursors in clsql (maybe with a
new keyword '...  being a cursor  for ...' or even '... being
a readonly cursor for ...')? I'd tackle the problem myself but i
have never before extended CL's loop syntax and can't even find good
documentation for that task.

 Cheers Ralf Mattes