A astromech that adds evade. And after perform a evade action you must perform a boost. If you can't boost, you can't take evade action.
A astromech that eats stress to repear shield. More stress = more shield recoverd.
A astromech that lower squad points with -3p or -2p. Open up to use torpedoes.
A astromech that grants slam-action.
A astromech that replace all hull to shield.