1- If you read the docs for the Taskbar3 you'll find that you can customize it the way you want.
2- I think it's just for Taskar3 and Systray2.
I'm using taskbar3 and systray2 together and they're working fine with no problems.
Check this out -
http://www.litestep.net/upload/profiles/Trespasser-Al-251.png