Choose screen on -nowm command line parameter

[Marcopole]

I'm really interested (cause it can be so useful for my church) if the command line parameter "-m" or "-nowm" not do the full screen always on the principal screen. Instead bring the option to choose the destiny screen.
I was looking SO HARD some way to do it but I didn't found any.

If someone want to know why:
I control the lights on my church, and I choosed QLC+ cause its the best free open source option that I found (its trully awesome and usseful )
But ife some day I'm not here, I want to have a "launch for noobs" in only the big screen. But it opens on the small screen cause -nowm runs allways on the principal screen.