Thanks for your responses.
Then I will take one companion with high athletics to help me passing some environment obstacles and one with high mechanics for traps/locks. For my main character (ranged cipher) I'm still not sure yet - maybe some stealth, athletics and focus on lore.
But regarding the lore:
"Lore represents a character's accumulated miscellaneous knowledge and trivia, often of occult or esoteric topics. In combat, it helps characters learn about enemy defenses and capabilities. Each time a character attacks an enemy, their Lore skill helps contribute to revealing their defenses and, for common enemies, filling in their Bestiary entries."
Source: http://pillarsofeternity.gamepedia.com/Lore
As I understand with a high lore skill you get more/faster information about the enemy per attack.
-- EDIT:
I've just checked the in game description and it's different from the Wiki. So, seems that the lore function has changed. Hmm, good to know - that way I wouldn't had pushed my char already to 6 lore.
One more question: Is it useful to have more than one character at one time to use scrolls / place traps? Or is one char for each ability already sufficient?