[ Feature Request ] Temporarily change cpu governor

Is there any way to change cpu governor on the fly without editing /etc/auto-cpufreq.conf ?
It would be fantastic to be able to change the governor temporarily, such as for current boot, regardless of whether device is running on battery or ac, for example:

```bash
auto-cpufreq --cpu-governor conservative # effective until next boot or restart of the service
auto-cpufreq --cpu-governor auto # usual setting respecting battery/ac mode
```

This can create other opportunities such as changing governor when certain application or a set of applications is found running