Adding line-art shading to line-art object

I'm hoping that someone can give me an idea of how to do something a little easier than I have been doing. It's a little hard to describe but without an image upload function on this forum I'm going to have to try with words alone.
I am drawing simple line art (entirely vector) objects with solid colors that need a 3d look to them. For instance, a simple balloon where the right side is in the shadow, so it needs to be darker. If I were doing it with a pencil I'd just shade the right side of the balloon in a crescent shape. In illustrator though I need to create another vector object to be the shading.
The outside of the balloon needs to be a solid black line. The object that becomes the shading needs to have no outline because it's just a darker color of the balloon (e.g. dark red to the balloon's bright red color). Making the outline its own object can't be done because it will either not reach the line of the balloon or its own color will partially cover up the black outline (because it is in front).
I've been successful at making these by implementing the shading as a large object that intersects the balloon, creating a live object out of the two, then setting the various line segments and areas with the live paint tool until it looks right. However this is time consuming and I wind up with an object that is conspicuously larger than it looks because of the invisible parts of the live paint object sticking out. Also, if things get just a little more complex with additional live paint objects then there are a bunch of line segments and live paint areas that I have to take care of. Maintenance of the object is difficult.
Can anyone suggest a better way to do this that doesn't involve live objects, patterns/gradients (everything needs to be a solid color) and doesn't take a lot of work to create?
Thanks!

One way is the old fashion way:
1. Draw balloon object with highlight color, no stroke.
2. Copy balloon object, paste in front, reshape copy into crescent by dragging individual points from left edge toward right; recolor this copy as shadow tint.
3. Paste in front a second time, assign no fill, black stroke to this copy.

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As for beziers, Illustrator uses cubic beziers which are fairly straight forward (thank goodness!). Here's a lift from Wikipedia's Bezier entry:
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I also looked on SAP notes.
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Log Message:
adding 'console' security constraint to MBeanServerGateway remote object for MBean tests and ds-console, used when running on Websphere with administrative security enabled. Should call setCredentials("bob","bob1") to use this RO.
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http://code.msdn.microsoft.com/HVRemote, if so, you can refer to the following link.
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