I've been using turbo boost switcher for a couple of months now with a base MPB16 and it's worked well. I pretty much keep turbo boost off all the time, barely ever notice any slowdown and it seems to help with noise & heat.

http://tbswitcher.rugarciap.com/

Happily sprang for the pro version, it's needed to not have to keep authorising it in on every switch.

> or keep the fans at lower RPM but constantly instead of letting the CPU idle at 60-70 degrees with no fans

My reading skills still suggest SMCfanControl fulfills the description given by the parent post