The window is only the terminal emulator-- what runs in it is the shell. You want to change the command prompt within the shell. at your shell, type something like
export PS1="\[\033[1;30m\][\[\033[1;34m\]\u\[\033[1;30m\]@\[\033[0;35m\]\h\[\033[1;30m\]] \[\033[0;37m\]\W \[\033[1;30m\]\$\[\033[0m\] "
(I got this from http://www.hypexr.org/bash_tutorial.php#cmd_prompt
I have absolutely no idea what the Title & Command option does in gnome-terminal but custom command runs some command instead of your shell, which is not what you want...