I was thinking about an idea & wondered if anyone was interested in fleshing out the details.
"Chaf".
Golfball sized perimeter defense anti-matter charges that are stored in regular cargo or ordnance-storage/deployment bays, & act upon collision with another ship or it's shields while being pursued.
They're designed for Starfleet Transport Command (& allied) freighters (ie: Deneva-Class) & as last-ditch items for fighters, shuttles, & Danube-Class to moderate-sized runabouts, when all other options (diplomatic communications, phasers & all types of torpedos,) have been utterly exausted.
Meant to overwhelm sensors / targeting systems & at max settings cause enemy hull breaches.