I thought Small Craft ECM was treated the same as DropShip ECM? ???
I had too, and it had been a while since I played, since my local club sticks mostly to Alpha Strike, so I looked up the rule again in Strat Ops (3rd printing - "Advanced Aerospace Rules", ie. the one with the Samurai ASF on the cover). On page 99, near the bottom of the first column, it reads:
Fighter/Small Craft ECM (regardless of whether or not the Small Craft mounts an ECM suite) only applies to other fighters and Small Craft, and is ignored by Large Craft
Now, that may have since seen errata that changes it, but it sounds like fighter/small craft ECM won't jam large craft.
With that said, though, page 99 and 100 go on to talk about ECCM, including by fighters and small craft. Beagle probes and ECM switched to ECCM mode
can benefit any friendly unit within their area of affect, but small craft/fighter ECCM can only target a single large craft: if there's an overlapping field by, say, a DropShip and a WarShip, you can only target one of them.
So, @Cannonshop's request is still a valid one, and such a design can definitely have utility. It just has to be carefully wielded, and construction may be a bit more interesting. I mean, there's also AESW missiles to consider, and how they may interact with bomb bay quirks.