All downloads on the eclipse.org page are only predefined packages of the publicly available Eclipse plugins. Thus, you can always install any plugin into any existing Eclipse installation (in the absence of dependency conflicts). Choosing a package on the download site determines only what is pre-installed (and it is difficult to disable pre-installed functions).
To develop RCP, you need the JDT and PDE functions. The classic and RCP development packages contain them, so it is still your choice.
If you really want a minimalist Eclipse to suit your needs, install the “Runtime Binary Platform” from http://download.eclipse.org/eclipse/downloads/drops4/R-4.2.1-201209141800/ , which is the “Empty” Eclipse . Then install only the plugins you have selected using the update manager.
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