I'm not sure exactly what you have in mind, but I guess part of it is already possible without any new tools :

- all frequently used long commands I shorthand with the shell's "alias" function - very handy, especially now that the latest xterm finally executes the .profile script at launch time !

- all commands I don't need to see the output of (like privoxy on/off etc.) I launch from the handy "cpu-applet with screenshots and launch menu"...