What I'm thinking would be a good addition would be an action option to reload the display of a button. For example, you have a button which outputs the result of some command/script, you could set action_hold to reload and it would re-run that script/command for an updated result.
I'm not familiar with Go, so I'm not even at a point of understanding how this program works as is, but I am planning to try to understand it because this reloadable button idea would be a major improvement in my opinion.