In one of the later S3 episodes, the NX-01 crew stole a warp coil from Damar's friendly crew, stranding them in the Delphic Expanse. Why didn't they leave them with some kind of transponder or something? Tell them if they survive, they will come back for them and either fix their warp drive or personally fly them all back home? There should have been a S4 episode where the NX-01 found them, their ship badly damaged, some of the crew dead, and had to face the consequences of their actions. I always hated this was never followed up on.