This needs to change.
If I've picked up 15 different missile types, it means I continue to have to cycle through all 15, even if I've only got 3 types left.
I suggested the same thing a while back although someone else replied to say they memorised the missile order.
I still think it would be a good idea to remove missiles with zero units from the cycle list. Someone who likes lots of missile types can always memorise their list after they have set it up.