I don't know if I understood what you need, but if you want the control bar to appear to the top of the screen when you move your mouse to the top, and to make the bar appear to the bottom of the screen when you move your mouse to the bottom, there's an option to achieve this, BottomTop option is to do this exact thing
This is an excerpt from base skin skinfs.ini file
Code:
[BSPlayer.Skin]
Version=1.00
[Settings]
MainAnySape=1
MainImg=fsmain.bmp
; B-Bottom, T-Top, BT-Bottom and Top 1-Left, 2-Middle, 3-Right
Position=B,2
ShowBtnGrpOnMouseMove=1
You can see that on 7th line there's a
Position=B,2 command, that makes the full screen control bar to appear at the bottom of the screen (B=bottom, 2=centered) only
If you modify that line as
Position=BT,2, it will appear either on top/bottom of the screen, depending on where you move your mouse cursor..
I hope this will help you, and if I misunderstood you, please explain me what did you meant ;)