[Deathstalker]

Seekers are tricky, any mounts made only affect the launcher (and not the seeker itself, so no extra damage or range, etc). But, you can go into the components.txt and make an entirely new seeker that has different damage types (ie, destroy only engines, weapons, boarding parties, security parties, etc).

As for other weapons and new abilities just use your imagination, I once had a Robo-Miner/Laser, worked as a Last ditch weapon in combat but was a fairly effective Robo-Miner otherwise.