I'm not "complaining" about the microplayer size. What i'm tring to say is that the microplayer bar is moved excessively in the direction of the red arrow. Or, if you prefer, the space highlighted by the green arrow is a little less than the space highlighted by the blue one. By the way, i just discovered that it's the same problem for all MM3 skins...i'm gonna read the thread linked by you, gege.
Supz, the pop-up volume bar seems to be impossible with MM3 skin engine, but (and i like it) whenever you hover on the MM icon on the tray you can see title, artist and time played/left of the song currently playing

