New weapon: entangler.

The Entangler: a modified shredder, this weapon spews a stream of heavy guage filament against the target, leaving them momentarily pinned down and helpless.

Range 8". Assault D6. S 3. AP 0. Auto-hits. Target unit cannot fire overwatch or disengage from combat next turn.

I always like utility weapons. I think it wound sound more logical to prevent 2 movement actions for an entangling weapon, like "disengage and advance". I don't really see the overwatch logic.
But it's a nice idea.

Not with the Overwatch, but could see it as "If the unit takes a wound, it can not Advance or Fall Back until the start of your next turn."