Hello!
Hmmm... I think the plugin could be expanded to add more pose triggers (like pressing a button to attack, for example), but it would require a lot of coding and testing, which I unfortunately won't be able to commit to right now (even though I had some ideas not too different from this in my backlog).
However, I think you could probably achieve something like that with some clever work with Common Events. For instance, you could setup a common event to trigger the actor attack animation (configure as an automatic animation the plays itself and revert back to the previous pose), and attach this common event to the attack button. I have not tested this, but it may work. It wouldn't process the attack itself on the target though, as the plugin has no functions for that (nor is its purpose).