1. Not sure what you mean. If you add many objects to a family, you can pick Family member by object name. For example:
System Pick EnemiesFamily by evaluate EnemiesFamily.objectTypeName="ZombieSprite"
2. Try moving the first four events on your screenshot to the bottom of the event sheet. Also, you need to use delta-time, and lerp for smoother scrolling.
So, instead of "Rocket move 5px" use "Rocket move 300*dt pixels"
Instead of "Set scroll X to scrollX+5" use "Set scroll X to lerp(scrollX, scrollX+5, 0.4)"
You can try different values instead of 0.4