Eu faço para você:
#!/bin/bash
#
# by desgua
#
# to disable Windows Decoration plugin at compiz
# start an app and re-enable this plugin
#
##################################################
previous=$(gconftool-2 --get /apps/compiz-1/general/screen0/options/active_plugins)
gconftool-2 --type=List --list-type=String --set /apps/compiz-1/general/screen0/options/active_plugins [core,bailer,detection,composite,opengl,imgjpeg,compiztoolbox,maximumize,place,text,resize,mousepoll,regex,shift,gnomecompat,grid,wall,dbus,extrawm,put,commands,imgpng,move,session,animation,wobbly,workarounds,expo,scale,ezoom,staticswitcher,ring,unitymtgrabhandles,unityshell]
gnome-terminal -e "bash -c \"sleep 2 && /home/desgua/Downloads/VueScan/vuescan ; exit ; exec bash\""
sleep 2
gconftool-2 --type=List --list-type=String --set /apps/compiz-1/general/screen0/options/active_plugins $previous
exit 0