I think this will implement removal of all "Super" key bindings for all vncserver instances site-wide.
[i.e. all those problems with "s", "m", "h", etc. that get in the way of vnc client applications]
Code:
# /etc/dconf/db/gdm.d/10-nosuperkey-settings
#
# This file is a site config file to disable "Super/Windows" key bindings
# so that vnc clients can operate properly.
#
# use "dconf update" to incorporate into db the first time
#
[org/gnome/desktop/wm/keybindings]
maximize=''
minimize=''
move-to-workspace-down=['<Control><Shift><Alt>Down']
move-to-workspace-up=['<Control><Shift><Alt>Up']
panel-main-menu=['<Alt>F1']
switch-applications=['<Alt>Tab']
switch-group=['<Alt>Above_Tab']
switch-input-source=''
switch-input-source-backward=''
switch-to-workspace-down=['<Control><Alt>Down']
switch-to-workspace-up=['<Control><Alt>Up']
unmaximize=['<Alt>F5']