This is not a removal of the activescreen but it is the best solution to the problems it causes.
Namely blurring and lack of themed wallpaper
All ya need is FExplorer
Windows paint
BMCONV.EXE
and maybe XnView
First install FExplorer onto 6680
goto options>tool>turn screenshot on and activate this function
Now make sure the theme you have installed has the standby page you want by pressing the menu key until the list appears in left corner and then select the telephone reciever symbol.
This is how the phone would look without the orange activescreen.
The main wallpaper can be changed by editing the theme in the phone>tools>themes folder.
You can select the default image or user defined(ya own)
If this is how you want the phone to look press the pencil button and the "0" button together.
You have now made a jpeg image in the gallery of the screen.
Send this image to your pc and open in paint.
The image sent is a 176 x 208 jpeg. You need to change it to a 176 x 188 bmp.
The best way to do this is to remove the bottom section. This is the taken up by the labels for the two function buttons either side of joypad.
Now erase the clock, signal strength and battery symbols. Remember to make a space in top right for orange clock and down left hand side for active screen menu.
Once you feel it is how you want it save file as a 24bit bitmap.
Convert 176 x 188 bmp into a 65536 colour 176 x 188 mbm using BMCONV.EXE
This site may help ya with that http://www.warlocks.be/serendipity/index.php?/archives/11-MBM-Tutorial.html
Name the mbm file BckGrd.mbm
To see mbm on pc you will need XnView but this is not important.
Send mbm file to phone like a normal image.
6680 can open mbm files as long as they are 65,536 colour. Save this image in phones gallery
Open FExplorer and find this image. select Options>Edit>copy
Still in FExploerer go to C:\System\Apps\HomeScreen
You will now see another mbm file with same name. This is the blurred one the phone shows on activescreen.
Select Options>Edit>paste
The new mbm will now replace the blurred mbm.
Restart Phone.
Now when Active screen comes on it will look like standard standby screen although you will still have to contend with the annoying menu.
You can use any 176 x 188 bmp image to convert into the orange wallpaper but this way the phone looks more like a standard 6680