Is there a list of what those icons can do ? For some it is obvious, for other that I tried, I was not able to figure out what they're supposed to do
The best way is just try them 
Let me understand better, tell me which ones are the ones that is not easy to figure out (or that doesn't do any noticeable thing)
i need to learn more of it..... @Thanatermesis can we add or remove some of the command configured in the top of the window?
not really, they are included inside the code