Hey,
Do you think in the future you could add the plugin called GroupPermsLIte.
I have tried using all three other permissions plugins that are available and from previous experience and alot of minecraft playing i find GroupPermsLite the easiest to use 
If you could maybe consider this for the future that would be great (il leave the link to the pluugin page in this thread.
Thankyou very much,
MINECRAFTADDICTED!!
GroupPermsLite Bukkit Page:
http://dev.bukkit.org/bukkit-plugins/grouppermslite/