I know how much work is behind your idea and i thing that your idea sounds interesting for many people, but its a balancing act between people who play the game for fun and hardcore gamer who stay ingame for the whole day. What i want to say is, that the whole game can change to a WOW-Like-Leveling-Game where regular gamer have an advantage over casual player. I like your idea to implement lite skills that don't change the game to much. The group idea must stay in focus, like having a benefit for finding items, because you are in a group and you have a closer eye on the ground or whatever..