Wow, this one's an oldie, but worth rediscussion

A homing meson would be quite expensive - a reactor would have to be fit on it to power the engine, as well as guidance systems - and a malfunction in the reactor core might just blow the whole damn thing.
On that note, if a homing meson
were produced, it would naturally require a plethora of escort ships, which would be in perilous danger, as they will have to be 3 clicks away when it blows. That alone would make it very dangerous. On that note, a similar effect could probably be produced by a decommisioned cruiser (can anyone say 'Fenris' or 'Aten'?) loaded with explosives. It would also mean a new chassis would not have to be developed.
However, meson bombs have so far only been used in destroying jump nodes (or attempting to - the first Knossos and the nodes leading to Capella). In this light, very precise conditions will be needed for it, and hence its probably not worth sticking an engine onto it to propel it to ground zero. And for anti-capship attacks, it is probably just as effective and much less dangerous for friendly craft to use the money and instead have several wings of bombers attack with Cyclops and Helios warheads, which prove highly lethal.