I have my main object moving by add_force(h,100,0,FORCE) for left and right (left being -100) and he moves along fine but when he is moving along my static platform, he tends to jump or bump around. The main object is set_body_frozen_rotation(h,1); and both objects materials have 0 static and dynamic fiction. I cant seem to pinpoint exactly why this is happening.

My second question, is can i make shift an actor that interacts with objects? I have my main characters code all sorted out, and would love it if he could interact with other physics and yet his physics box stays with him?

If your platform is made up or multiple physics objects, a physics object sliding along will jump a bit when it hits the next part of the platform. If your platform is only one physics object, then I'm not sure what could be causing this.

I don't get entirely what you are asking. "make shift an actor that interacts with objects"? Please elaborate.

if hes bumping and jumping on a static object, put the closest pixel, 1 pixel away from the static object.

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You could try to handle collisions in the step event, it may be that the built in collision system always puts you back at previous x and y coordinates causing you to bounce.