Scrolling cursors in PL/PgSQL

Hello.

Is there a way to scroll a cursor from within PL/PgSQL?

I tried EXECUTE, but:

ERROR:  cannot manipulate cursors directly in PL/pgSQL
HINT:  Use PL/pgSQL's cursor features instead.

The idea would be that PL/pgsql function would look
through (all) query results, then rewind the cursor and
finally return it.

My fellow developers have created a function which run
the (complex) query twice (first a count(*) on the result
set, then return the row count and cursor to the results.
Then they created a version which uses temporary
table as a placeholder for the query results, and results
count and a pointer to select * from tmp_table.

Now I imagined a function which would open the cursor,
MOVE FORWARD ALL, then MOVE ABSOLUTE 0;
and return count and a cursor, yet it seems it won't work.

Any other idea how to efficiently solve such a problem?

   Regards,
     Dawid