How to Extend a plugin?

I have a plugin that has some basic set of functions.
I want to be able to Extend this plugin, without having to go in an edit
the code.
I would like to do things like add extra fields to the Table and have
the Views, Model and Controller be able to handle this.
I would also like to add some parameters to links.

I know that I can provide new Views using, /app/View/Plugin/....

But if I add code to appController::beforeFilter  - this is for ALL
controllers, not just the plugin, so I would have to check to see if
this is a controller, then possibly make changes.
Same with beforeFind or beforeSave, etc.

I looked at callbacks, but if the plugin does not implement any, then
this does not work.

It seems like this is possible, but I am missing something.

Can anyone point me in some direction?

Thanks in advance.
Bill

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