remove not needed packages without removing half of gnome

I am using a desktop system with onboard nvidia graphics device.
When I try to remove package "radeontool" (that I shall never use on my system) it gives me the following:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libglew1 libusplash0 python-pymetar libdecoration0 libast2 libgadu3
  libaudacious4 lsdvd libvncauth0 libstdc++2.10-glibc2.2 libedata-book1.2-2
  python-wxversion python-wxgtk2.6 python-xlib libimlib2
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  acpi-support gnome-power-manager gnome-session powermanagement-interface
  radeontool
0 upgraded, 0 newly installed, 5 to remove and 4 not upgraded.
Need to get 0B of archives.
After unpacking 13.2MB disk space will be freed.
Do you want to continue [Y/n]?

The same case with laptop-detect package....and there where other cases...

question: Is there a way to remove these without removing essential gnome packages?

PS
And why do I need over 20 packages (xorg drivers) for other video devices from other manufacturers? I have to manually uninstall them. Why doesn't ubuntu uninstall them automatically after it detected the one I use automatically?