Yes, there is an ATI Control Panel for the Macs, you have to download in from ATI. It allows you to set certain options for Radeon cards both OEM and Retail. The latest version, for Intel Macs, is not available from ATI's site.. it only shipped recently with the Radeon X1900XT cards I believe... let me find it........
found it http://aarongyes.com/guides/atidisplays , but damn, he's made it harder to install. Rather than just providing the control panel he tells you how to get it from ATI's installer which you have to fool.
There is also a overclocking utility for Radeon cards available, but I'm not sure if it's been converted to a universeral binary, yet. I'd have to check.
IHow am I going to control the video card when I get the dvi adapter to connect to my t.v?
I didn't read through your whole email. To answer this point, you would do that, as Vexel says from the Displays Control Panel. The ATI Control panel is more for setting gaming options such as OpenGL options, vsync options, etc. That's probably why Vexel didn't find it too useful. It's mainly useful for gamers.