Feature requst: post-hop actions

[postsolar]

Maybe I missed something in the README but I'm not seeing a way to execute actions after the selection has been selected. Is something like this currently possible?

I was going to add two commands examples to the README, for adding a selection as a new cursor and extending current selection. These would start with Z before the hop and end with <a-z>a and <a-z>u respectively after the hop.

I could maybe dig into source code to see what happens and what could be hooked into, but I think it would be awesome to have an established interface for this.