If you don't want to use skills simply make INT test.
But to add some bit of personality to the scavengers, you can give each character a random skill that start at level 1.
Skill ratings range from level 1 to 2.
To make a skill check make a 2d6 test against INT+SKILL level.
You can also add in a difficulty factor:
- Easy: +1
- Hard: -1 to -3
Some possible skills:
- Piloting (to pilot spaceships in normal space)
- Engineering (to repair stuff)
- Demolition (to remove explosives)
- Sensors (to scan stuff while in your spaceship)
I would probably let each player choose a skill to attribute to one member of his/her crew.
(So only one character by crew of 4 would start with a skill) (but I have to test this...)