Note: In Maya 2012, uncheck the 'Enable Points' checkbox on the Points node to get stop the errors (it's a Maya bug).
The Waiters Attribute Editor is also the place to create nodes for the network, set the initial state for any objects and there's also a helper button to hook MASH up to a Maya instancer.
When in instancer mode, MASH will pass all of the calculated values to a Maya Instancer node.
You set the number of instances by editing the value in the 'Number of Objects' box once the Instancer Mode checkbox is set. When this checkbox is on, the Waiter will stop effecting objects in its selection set.