I'm not sure what exactly you mean by autokey, but you can implement various keyboard tricks on various levels…

If you have a compositor that supports plugins, such as Wayfire, you can write a plugin: https://github.com/myfreeweb/numbernine/blob/master/wf-plugi...

You can also do things on the evdev level by listening to keys and emitting new keys from a virtual device. My tool for that: https://github.com/myfreeweb/evscript