Would you need to have the Show control module for Wings in order to adress about 150 DMX Channels?
Yes, with over 150 DMX channels, you will need the Show Control module. Without Show Control module allows only 32 DMX channels with Advanced, Pro and Multidisplay versions. Look up the Help Files table ('versions and modules'). You also need Advance, Pro or Multidisplay version anyway for them to 'talk' to ISEO as a device.
How can the programming be done in Wings, since my actual workaround heavily depends on variables for fades delays, start times etc.?
Not sure what you mean by 'variables for fade delays, start times, etc'
You can manually trigger the delays or start times with a Trigger in Control Panel. If you want auto-start and not manual trigger, I don't think Wings can handle that on its own without the SC Master 'Special Functions' feature.
Hang on...think ISEO itself can handle variables. I'm not that familiar with ISEO in this area. Try the ISEO Help Files on variables.