0=never write a $ACTIONS item in a design note. This saves space at the price of incompatibility with V4 clients.
1=always write the $ACTIONS item (same as earlier versions).
2=only update $ACTIONS if present, don't create it.
$ACTIONS isn't needed unless you have clients of versions earlier than 5.0 (and in that case you shouldn't be using Designer 8.0.1 anyway).