Greetings,
Codewarrior is a commercial tool, while KDS is a free but powerful tool. There are going to be features found in Codewarrior that may not be available in a freeware.
Concerning memory location, go to the "Window" menu -> Show View -> Memory/Memory Browser.
P&E's contribution to KDS is the flash programming and run control when using P&E hardware interface. The peripheral registers are the responsibility of the Freescale IDE team. So even if you switch hardware, you will still run into the same problem with not being able to view any peripheral registers.
Takao Yamada
P&E MIcrocomputer Systems