ReActPSN features

... Now I have very little experience with the app, but one thing I can say for it is the Readme, can seem a little confusing at time (though more clear of late). It seems to me though that each version has features that were not in the previous and sometimes overriding the button for certain commands.
... So I guess what I am getting to is can anyone give a list of what each button does for each version of this software?