Nanite weapon would be quite useless against the shields, yes? I agree that it would probably eat the hull alive, and have some sort of minimal guidance, as the nanites correct their motion towards the target... but, no shield damage, or very very low, please... also.. ammo weapon? very high ammo count, yes.
A homing laser would be kinda-sorta feasible. One explanation could center around charge differentials: the weapon 'paints' the target with a negative charge of some sort, and then releases a positively-charged beam that homes in on the negative charge. This is a very very simplified model, but seeing as how artificial wormholes can be made in a jumpgate, I imagine that technology is sufficiently advanced enough to allow something like a homing laser to exist.
Maybe some day, they'll see a hero is just a man who knowshe's free.
I was thinking Traking nanites. POssibly self replicating. BUT while it should track, It MIGHT not do that much damage,because Space and weapons fire, would slash them up, i was just thinking It might be a alternative to Standard guns