Please allow specifying a touch policy

[foozmeat]

I need a touch policy of cached in order to handle connecting to many servers at once during ansible provisioning. Adding a touch policy prompt during setup would be greatly appreciated.

[drod3763]

Ideally we can have a config file to put preferences like this in. The simplicity of the setup is nice but I don't need this level of security for every single connection so hopefully this get a little more love.

[jralbert]

Hopefully this isn't over-stretching the original issue description, but @drod3763 is right that being able to override the setup defaults either with a config file or additional command line arguments would be extremely helpful. For me, this is about being able to specify the key algorithm to generate with, as many hosts I need to connect to will not accept ECDSA keys. Would there be interest in a pull request to implement some form of this feature?

[FiloSottile]

This should be resolved by #95, please check out the plan there.