Running multiple instances of xterm

Go to the Attributes menu -> Application Specific and select "No application icon" for XTerm.

Then right-click on the docked appicon and select settings. Change the Application Path with arguments section to:

   /bin/sh -c "exec xterm &"

Or:

   /bin/sh -c "exec gnome-terminal &"

Gnome settings

Create the following file if it doesn't exist and change it's permissions:

 chmod 755 ~/GNUstep/Library/WindowMaker/autostart

Content:

#!/bin/sh

gnome-settings-daemon

Go to the Attributes menu -> Application Specific and select "Start Hidden".