We don't know, FL2 was never released.

I presume you mean the style of the engine effects? In that video you linked there's nothing special going on in that effect, it's just a simple glow. Most of Freelancer's engines already do this, only with more particles and fancy stuff added.

If you're talking about EVE-style engines, as in the whole anamorphic lens flare deal, then that can be accomplished with ALE editing. I did such a thing for this video.



Unfortunately you run into the same issues that EVE used to have until only very recently. The lens flares are just sprites, so they can clip into the ship model itself. It looks really odd. They also cannot be directional like EVE's lens flares, meaning you can still see them even when something is obscuring them.

The only way to accomplish a directional lens flare is through the use of lights, but lights cannot be affected by the engine, so it would be a constant glow/flare.