Windows 7 jump list size

hi, I've created a couple of new toolbars with shortcuts to my most used programs and documents inside. the problem is, the jumplists for them are not big enough. Idealy I'd prefer to just have icons in the jumplist and have them twice the size.
Also, I'd like to have the button for the jumplist to be wider.
Does anyone know where abouts in the registry I can alter these settings?

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