My suggestions are based on my experiences as an artist and as a programmer and I believe that Paintstorm can be a truly amazing program, it's GUI is already way ahead of anything Adobe or anyone else has put out. I've coded several programs in AutoHotKey scripting language to either add to or improve the functionality of both of these programs. I'm also very familiar with Photoshop as it was my main program before SAI.
So my workflow developed mainly from SAI. I'm on a windows 7 圆4 machine, coming from Easy Paint Tool SAI as my main drawing and painting program.