A suggedtion(s)

it's not that big problem to implement few buttons and commands

Yes, it is. Every button and command you add makes it that much harder for the beginner to understand and use.
Already the "boards" menu has become too crowded (IMO.)

I would like to see a more logical temporary directory scheme for the sketch object and hex files. I liked the old sketchdir/applet scheme much better (mostly.) I understand the new behavior is inherited from Processing, where the build directory has fewer interesting things in it than Arduino...