Hello Stefan,
For now, I'm afraid there is no way to do this. This is nevertheless the object of a feature request already referenced in our database :
fz.#2335 => Be able to choose the way a window gets open (Minimized, Maximized,Default)
I added your name to the list of requesters. There is currently no date planned for implementation mainly due to other priorities, especially the version 2.20. However, it has been taken into account, and the development team will evaluate the opportunity of implementing this in the future.
Thanks for the suggestion,
Best regards,
Lionel