Custom settings are possible for this two games?

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I can't understand why people are constantly requesting this.
Is it really all that hard to enable\disable certain option if the game you are playing is requiring it,are you actually playing more than one game per hour\day so you need to keep settings for every game separately.

When I play a game,I play only that game until I finish it.
Most of the games are working fine with the default settings.

Under windows there is a way to have settings per game(using command lines).