Customization of MotoDESStudio4Android first starts with come correct information.
Other than MotoDEvStudio4android the plugins pictured are the only ones you can install. You cannot install rest of eclipse that Moto took out which means you have to download the Eclipse Memory analyzer to use with android as an RCP download to use a separate application.
I still do not why MotoDevStudio4andoid staff would continue to indicate that you install plugins from eclipse that they took out as its an underlying MotoDevStudio limitation that has always been present in MotoStudio IDE products. That does not mean that the tools are not useful, its just that I believe the greater sum of parts can be gained by incorporating MototDevStudio additions on top of a full Eclipse install.