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Cocos2d scheduling selector in child node
ParallaxMultipleBackgrounds *background = [self getChildByTag:GameSceneBackgroundBase];
//I TRIED THIS:
[background schedule:@selector(([background changeSpeedFactorBy:3])) interval:1];
//AND
[background schedule:@selector(changeSpeedFactorBy:3)];
//AND
[[background schedule:@selector(changeSpeedFactorBy:3) interval:1] ];
//BUT..

ParallaxMultipleBackgrounds *background = [self getChildByTag:GameSceneBackgroundBase];
background.modifier = 3;
[background schedule:@selector(changeSpeedFactorBy:) interval:1];

CCCallFuncND *call = [CCCallFuncND actionWithTarget:background selector:@selector(changeSpeedFactorBy:) data:amont];

CCDelay *delay = [CCDelay actionWithDuration:1];

CCSequence *seq = [CCSequence actions:call,delay,nil];

CCRepeatForever *repeat = [CCRepeatForever actionWithAction:seq];
[background runAction:repeat];