> That's how I use it today.
> But, what if you want to add classes from other categories, 
> that do not have the prefixed name?
> For instance, I have an app and all the classes are in the 
> same category. No problem. But, I have a plugin that I want 
> to include in this package, but I want to to stay in another 
> category. It does not have the prefixed name (in your 
> example, it does not have the "CoolProgram" prefix.) How do 
> you add that -- w/o adding that complete category as a 
> required package?

That's what the dependency mechanism is for, add that other package as a
dependency of this package, rather than trying to put it in this
package.  Packages are the proper level of reuse, not classes, so if you
use one class from another package, then you rightfully depend on that
other package.