Hmm. A lot of people want interdictor ships like the Immobilizer, CC-7700, or "Modified Strike Cruiser" (which could be renamed to Peregrine-class Strike Cruiser if they wanted). I do, too, but what purpose would it server in-game? In Empire at War, they could confuse the guidance of warheads in a radius, which was a really gamey trait they invented for that game (and one that ended up making the Zann Consortium even more brokenly-OP, because their mass drivers were unaffected). However, in addition to the fact that that's something that exists only in that game, it doesn't really work as well in Armada, since all weapon types are condensed down into dice colors; there's really no telling how much of the black dice's firepower is contributed to by laser cannons as opposed to concussion missile launchers.
However, what if Armada introduced a new element to the game? Reinforcements. Let's say that you can hyper in reinforcements at various points in the game. THEN an interdictor is useful! Because the interdictor could allow the interdictor's owner to place rules on how enemy ships can enter; reinforcements cannot enter within distance 3 of the interdictor, for instance. Distance 3 is still kind of limited, but since there is no distance 4 or 5...
And hey, if they introduce a reinforcement mechanic, maybe they'll FINALLY introduce the XG-1? :-P That was typically what came as reinforcements for the Imperials in TIE Fighter, when you called for them.