Automatic fan speed adjustment?

Currently I have the app SMCFan running on all of my Macs to regulate the fan speed in order to cool them down. And on all of these Macs I have different presets that control the RPM of specific fans. I have few different fan settings on my iMac according to the intensity of the task and the temperature of the hardward (I use MiStat to monitor my computers' temperature).
Here is the issue, my brother play games all the time and usually it drives the GPU and CPU up to 60-70C all the time and I don't want to turn my fan to maximum or over maximum the entire time including when its idle just to make sure it runs fast when my brother is playing games because: 1) it can potentially shorten the fan's lifespan, 2) it gets extremely loud especially on the iMac where the fan is gigantic. I can only go in and adjust the fan speed when I notice my brother is playing game via Screen Sharing from my MacBook Pro but I'm not always looking out for when he's playing games so there are times when the GPU shoots up to 70-80C and I won't know to adjust the fan speed.
For that, is there a way for me to set my iMac, or any of my Macs, that when the CPU or GPU activity hits a certain point (by % of activity or the temperature reading of the processor itself) it will increase or decrease the fan speed according to my settings automatically? If there is it would be extremely helpful to keep my iMac last longer.
Thanks ahead.

You are trying to fix something that isn't broken.
OS X controls the fan automatically to protect the cpu.
Third party fan control software is not needed and may, if configured improperly, result in damage to the cpu although an Intel cpu is supposed to shutdown if it gets too hot.
The minimum fan speed is 2000 RPM.  It will start to increase around 70 degrees C.

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