Oh thanks, no worries, thanks to two guys in the rtvfx forum I got to hook up those vertex streams via additional texture coordinates (as it is intended). And thanks to some math help of a friend, got this shader going with shaderforge and unity 5.6 https://realtimevfx.com/t/unity-5-5-5-6-align-mesh-particles-with-velocity-using-vertex-stream/2328

Oh how is it going with this one? Really could use those streams in shaderforge. I want to get particle mesh aligned with velocity, and there are 3drotation and velocity vector stream I could use for that and then feed back into vertex offset