I'm using Avant Window Navigator and don't have any gnome-panel. But, I wanna resize my workspaces from 4x1 to 2x2. But in the help and other documentation, to do this, I must right click in Workspaces applet in gnome panel. Can I do this without activating gnome panel?
You can configure your workspaces through CompizConfig Settings Manager (ccsm)
It's placed in System > Preferences > CompizConfig Settings Manager.
You will find the setting under General Options>Desktop Size.
Don't know if indicator-workspaces will is what you are looking for you need to install i from a personal ppa.
in terminal type
it will be in your accessories menu.
Hope this helps