Its easy to scale any DynamoBIM Geometry
If you use design script then it only takes one line of code!
Follow the steps below

1. add the following designscript code in a Code Block in DynamoBIM
    ANYNAMEYOUWANT.Scale(SCALEAMOUNT)
2. Wire any DynamoBIM geometry into the input port on the code block
3. insert any scale value you want and watch is scale!
This process is summarized below

Note that the Dynamobim geometry is scaled based on the geometry origin. If you want to scale about a different origin point then you have to use a different design script. Also note that this process only scales DynamoBIM geometry.