how to create android emulator in command line with options?

I want to create emulator in command line with some options, like hw.mainKeys = false. I need it to be an shell script so can run on automation test,however here I could not find a place to set those values.

android create avd 

do not have a place to specify those options.

One alternative is create a 'platform' type avd, however, the shell is a interactive shell that is great for human but hard for script

Android 4.1 is a basic Android platform.
Do you wish to create a custom hardware profile [no]yes 

Name of the AVD being run: 
avd.name [<build>]:

Are there some tools I can just pass options as parameters, like --hw.mainKeys false ?