Hello Robrolefes,
The trick here is to use the 'Virtual Dimmer' option. When creating your patch, you select the Generic RGBW fixture, then, in the lower section of the screen, there is a row of buttons. One of them is called 'Virtual Dimmer'. When you press this, you enable the software generated dimmer channel for your fixtures (if it is turned on, the fixture block shows a 'D' in its lower left corner). This is just a fancy way of sying that you can apply an intensity to your fixtures, including the intensity FX's.
About your second question, I suspect that this is a personality issue, so I have reposed it for you at the personality section of the forum see
http://www.visualproductions.nl/forum/index.php?topic=4507.0Hope this helps and best regards,
Jurrien