Ramana, Maybe I do not understand what exactly you are looking for. Maybe you have some concrete examples.
Anything that somehow changes the configuration of the target has to go into the root file system one way or the other. You can easily include packages into the root file system by adding them to the IMAGE_INSTALL variable. But no matter what BitBake will have to re-run the tasks building the root file system. That works fine for a small number of devices but it does not scale. If you need to scale it you need to do configuration management after you have brought up the device for the first time during test. Then you can use the package manager to install new packages. :rjs
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