You can add those environment variables to your command prompt permanently. And No, Billy, this won't work by simply editing System Properties, so read on...
Four files and the PSEXEC.EXE utility are needed - save all 4 files in the same directory in a share(such as \\server\share ) to prepare to deploy your groovy command prompt on every server under your influence.
I changed the command prompt to better keep track of which server and which credentials are in use, and added a timestamp.
CMDPROMPT.BAT - contains the prompt with your preferred environment variables and gets copied to %windir%
prompt $_[%ComputerName%\%Username%] $t$_$p$g
CMDPROMPT.REG - get registered on the target machine(s) to invoke CMDPROMPT.BAT when CMD.EXE is executed
Windows Registry Editor Version 5.00
CMDPROMPT-INSTALL.CMD - the installer script - important for deploying the prompt to multiple machines
copy /Y \\server\share\cmdprompt.??? %windir%\
regedit /s %windir%\cmdprompt.reg
SERVERLIST.TXT - a list of target machines(one per line) that will receive the newly minted command prompt goodness.
Now to install! Open up a command prompt and cd to the directory containing the SERVERLIST.TXT , then run the following:
psexec @SERVERLIST.TXT -c -u DOMAIN\%username% \\server\share\cmdprompt-install.cmd
Login to some of these target servers and enjoy the utility of the improved prompt.