apple tv ssh script automation
you could ssh root@apple-tv.local killall AppleTV, also you might want to change your passwd from the default. As for a icon, you could but the above into a file and name it with a .sh extention, which could then be 'clicked on'.
If you don't want to be prompted for a ssh passwd, set up some ssh keys.
Setting up ssh keys
If you already have a key on your computer, skip to step 2

ssh-keygen -t rsa and follow the the prompts. If you use a passphrase, you'll want to set up ssh-agent.

Copy contents of ~/.ssh/id_rsa.pub to ~/.ssh/authorized_keys on the tv.

chmod go-rwx ~/.ssh/authorized_keys


This is just a quick example, check out this wiki for more.