Brian: Attunement. In our rules, every spell ability in an item, power storing, recharging etc all require attunement skill. Plus, many althan/ka’ta’viir devices use mental interfaces which can be accessed with attunement. So even non spell-casters should have some ability, especially at higher levels.
Peter: Lore skills particularly those relating to herbs. Whether you use Herb Lore, Herbalism or Lore:Technical. I suspect that my game is a bit more hack and slash than Brian’s but being able to select the right herb and apply it is a key skill for my players.