When I saw EVE weapon I was thinking more like the 'Warp Scrambler' module. Target enemy you don't want jumping, Activate module, 'nojump4u.troll.jpg' if they don't have the proper counter measures.
But we don't really have a proper targeting system, so I really like the 'activate module, create a warp scramble bubble' with it's size (Not really having a max size, but more and more modules would increase it in increasingly tiny increments) same with the length of time it's active.
Just a quick thought: Having a 'Warp Stabilizer' counter measure. But instead of completely negating the scrambler, it just reduces the effective radius for that ship. You won't be able to escape completely right away, but it'd take less time for you to enter jumpable space again than one ship without the Stabilizer.