Shortcuts

Having some shortcut is very useful for 'regular' users (like the current 'save' one). I can suggest two improvements:

• notify it on the interface that those exists (in tool tip for example). On the 0.4.0 it looks like the save shortcut is not mentioned (or I missed it)
• a shortcut for execution could be provided (if not already else issue is on the upper point). Like Ctr + R (and then rename 'execute' to run would ease thinks) or Ctr+shift+X or whatever male sense to you. As Loic mentioned Ctr+x is probably to avoid.