How about a New "Warm Up" and Training kind of Aim Duel Mode?

- You and your opponent spawn on a random Map
- the area is limited, for example: Only Haven A, rest is blocked
- Spawn areas are the normal CT / T spawn but you can only access one Bombspot
- you start with enough credits for a full buy
- after every duel, your opponent gets swapped out until you quit
- matchmaking is based on rank