I installed Backtrack 3 on eeepc. How I remove programs?

As some of you may know the eeepc only has a 4GB drive so I want to get rid of things I don't need from the Backtrack install such as Kopete etc.

Also I have noticed when I open applications because it is quite a small screen I am always having to move or drag them to reach the Apply button; is there away for KDE to detect the screen size and arrange the windows so they align up to the KDE taskbar and not below it so I can see the entire window.

Thanks alot