libpq usage question

I'm working on an update to contrib/dblink which would allow
INSERT/UPDATE/DELETE statements in addition to SELECT statements against
a remote database.

In the current version, only SELECT is possible because the SQL
statement passed to the function gets "DECLARE mycursor CURSOR FOR "
appended to the front of it, and the result set is obtained with "res =
PQexec(conn, "FETCH ALL in mycursor");".

My question is, what is the downside (if any) of eliminating the use of
a cursor in this context? I have locally made the changes, and don't see
any negative impact. I'd appreciate any thoughts.

Thanks,

Joe