I have been thinking of a few weird epic interactions and I'd like to confirm some of them:
1 - Howlrunner allows the Raider to perform rerolls on its primary weapon attacks
2 - Jonus allows up to 2 rerolls on every of the Raiders attack with its secondary weapons (ouch!)
3 - This one is weird is stretching it on the words: If the Raider has a weapon Engineer and Colonel Jendon transfers a target lock to it (because it had the Lambda title), does weapon engineer allow the Raider to acquire a second target lock?
4 - You could, potentially, use a secondary weapon like the quad cannon, miss and use gunner to fire your primary weapon attack a third time this round (so in essence, keeping your secondary weapon that is the most likey to miss for last as a trigger). This is assuming you fired your primary weapon twice (normal + spend 2 energy) initially.
That's about every weird epic combo that I can think of for the Empire. Number 3 seems sketchy, but the rest seem legit, right?