Can we get a setting to have walls block projectiles i really want to use the Shield Projector mod with rampant as it's perfect for it but sadly if the walls dont block projectiles shield projectors are absolutely useless with spitters.

This already exists. All walls, including Shield Projector, block projectiles from most Rampant spitters. Exceptions are fire and inferno spitters.
If we are talking about standard biters or biters from other mods, then I can’t help here.

Im not seeing the setting still but it might be because im using the forked version so i can play it with space age and my Shield projectors and walls dont seem to block any types of projectiles turrets just get targeted past them.

7 months later: walls aren't blocking any type of rampant projectile. Neither the vanilla walls, nor any wall added by a mod. Decided to scrap my play through with Rampant after just 5 hours because it just isn't tenable. Even the baby spitters, especially the electric and laser variants, just decimate any type of defense I try and mount. I was never able to build and keep a furnace stack. (Default settings, default map settings.)

Can confirm, I just tested in editor mode.
I understand the gameplay value in having some enemies be able to shoot through walls, but I also think there should be a toggleable settings to make walls block ALL attacks for those of us that would like that.

Dimm, you ever going to address this? Been over a year to the day it was reported as broken.

I think it would be best if you sent me a save file so I can reproduce your situation. Because with default settings, vanilla walls and the Rampant Arsenal walls block projectiles. Exceptions are electric and fire attacks.

Also, please use a minimum of mods, as the mods.factorio.com site is blocked in Russia and I won't be able to load them automatically.