I found a way to change and/or remove tray (taskbar?) icons. Please bear with me since I'm old and may not know the correct terminology. This method has worked for me on an HTC HD2 with android and 3 different ROMs on my Tmo Galaxy S2.
1. Click on applications
2. Click on Menu
3. Click on View Type
4. Click on Customizable Grid
5. Click on Menu again.
6. Click on Edit.
You should now be on a screen with resized icons in tray and homepage. Long press and hold the icon you want to change and just push it out of the way. Similar to adding apps to your homepage. If you want to add a favorite app to the taskbar just long press and drag it to the tray. Once you have removed or added the icons you want, hit the back button and then the menu button again. Click on Save. Hope it works out for you. It's really pretty simple once you attempt it.