Let's go with the assumption that your real motivation for these custom wars is to:
a) Remove or reduce prep day
b) reduce war days
and ultimately
c) war more often
The rest is just fluff you added to make it seem like a more intuitive idea.
99% of people will have those two options selected and no one will use any of the other features, like all Air Raid war or No Spell war, and you know it.
