I guess they want you to use flymod? As you would have to add a new plugin to give /gm c and /gm s (which takes up data space) or, if you gave VIP+ /gamemode (name) 1, then that would give them power they could abuse by giving members creative.
PS. Since drag0n is making 3rd server, could this one be different for lowmods? By giving them mod powers other than ./rank. Architects had more power than lowmods, and VIP/Donator was almost exactly the same as lowmod, except for /jail.