First one word why I started to wrote this news.. I noticed that I mostly
blast my first three or four types and I have those three there like for
nothing (yes there is some reasons I have them but)

Ok, what came to my mind was.. What if changing types in combat makes your
blasts combinate with each other. I blast monster with my primare (scream) and
normally I keep blastin it until monster is dead..
With changing types like primary+second, you could reach some extra damage
because those types combinate well or semi-well.. what I'm trying to say, here
is couple examples:
I'll lavablast Chopper, then I'll next shoot coldray, monster screams both and
the combination of cold and heat would make it shatter abit faster..
Also somethinkg like electrocution+poison would combinate well.. First you
poison your enemy with couple of blasts and then give small shock with
electrocution.. "muscles would speed their work and poison would be more
effective".. you got the (tired?) idea ?

Well, I'll cut the crap cause I think you got the point.. this would in my
opinion, extend the use of types.