A common trick is depowering a weapon partway through its firing animation to, for example, fire only 2 shots from a BL2. Not sure if this is as well known, but I discovered that weapons can even depowered before they fire their first shot if you're fast enough. This still counts for weapon training, so it's possible to get infinite weapon training on shieldless autoscouts without killing them.
If more crew is desired, it is a good idea to upgrade the Medbay as it offers many blue options for getting crew or denying the risk of losing one. You also get plenty of additional crew options with a teleporter.