To make the skills Heal and Repair more usefull, I'd suggest to be possible to heal others using the healers and the repairs kits during the game and not just when a player goes unconscious or restig near a shrine. It could heal an ammount of damage based on the skills levels + a dice roll such as:
Skill +18
Healer's kit +5
d20 Dice roll: 10
Heal: 33 hit points
Best regards
Domingos