Thank you @TechLord for the compliment.
Sure it is possible to mix and match geners, i was more talking about time this would need.
And i do not like it myself very much. I remember at games like contra or axely from super nintendo. I hated the moment they switched the viewport.
I think if you play a railshooter then you want to play it as such, the same for the others.
Rpg´s are kinda special i think.
About multiuse of projectiles
I guess using projectiles the way you told would not really possible for me.
I use linetrace & projectiles.
For example in the shump i worked something out so you dont move the background as the most do (not sure if not all) instead i move the player and clamp the movement to a definet part.
In fact if an enemy shoots a projectile i trace the player position and adjust the speed of the projectile and also lock one axis, if i would not do this this movement i worked out wouldn´t really work.
But i would more then happy to hear and learn something new. I am allways wide open for any suggestions. 