That kind of thing sounds great, which is why I got into fan control in the first place. However, I worry about "software control". Software has a bad habit of hanging or otherwise failing to work. If the fans get stuck at a slow speed because the software didn't do it's job...
That's why I'm doing a pure hardware approach with thermistor control instead of software.
If you had a watchdog override which allowed software to be overriden if it wasn't working, that might work well. But, it'd be much more expensive I think.
Also, were you thinking of a continuous range of power control or a set of discrete steps (e.g. 5V, 7V, 12V)?
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