Here's the issue with that and Torque emitters. In Torque, emitters emit small image files. If it simply did that, you'd be set. However, like in many game engines, because the particles are 2D, they always face the player. Which leaves you with a few options.
A) Combine several different emitters for one projectile, each with its own different arcing texture, but less like a long strike and more like a blob.
B) Texture a projectile with that, maybe adding some emitters for extra motion.
C) Figure out how to tile an image/textured model along a raycast, if possible.