No, the only way is to force the players to do that.
Example 2 starting positions, 1 for player. the first one is part only of Objective 1, the second is part only of objective 2. Everything else can be shared. obviously the 2 starting positions can't be taken by the opponent (pl1 can't take position 2 and pl2 can't take positions 1).
The only thing...this is valid only for 1vs1 map, with the normal map type would be a problem with assassin games.
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