Another quick suggestion. Sort of how it was in Mass Effect, you should be allowed specialize in a certain field. This will allow players to experiment with different play-styles and play how they would like to play with benefits. It would also be better if you chose a specialty mid-game, as the player by then would have gained enough knowledge to choose what they want. Examples are a Mechanic, who gains bonuses from vehicles and such. Or a Gunslinger, who gains bonuses from short-ranged guns (add onto this list, if you would like). There could also be a Jack-of-all-Trades, who gain very minimal bonuses from everything.
