We can easily apply different process settings to two different objects to slice them differently. Is there a way to apply process settings to a specific volume region? For example, if you have a whistle (e.g.: http://www.thingiverse.com/thing:1046), you may want to make sure the walls are airtight (many perimeters and high infill), but the ball inside is as light as possible (few perimeters and low infill). It's all one stl file, and the object that needs the different slice settings is inside the outer object so I can't (easily) split it out into a separate object. If I did, I'd have to position it in space in exactly the right place.
Suggestions? Request a feature? Or is there a capability already present that I"m not aware of?
Zack