I have recently been reviewing the DosEmu thread on the list. Here is my concern, why not try doing something like XEN for reactos. CMD.exe could interact with all of the XENed hardware and software. One major feature this would be great for is if someone needed to utilize a EXT3 disk image or hard drive from ReactOS in the future all they would have to do is pop open the cmd prompt and cd to a virtual hard drisk something like C:\Volumes\HDA1\ would be equal to / on the linux volume. A system service would also need to be implemented for starting the other os on command, but that is only a suggestion...
Rick