You can not disable the Gear icon in Go. You can have scripts not appear under Perform Script menu by deselecting it from Manage scripts. If the script has a check mark then it will appear if it doesn't, then it will not appear. This setting is the same for Pro and Go.
Thanks for the quick response. Dis-including the scripts from the menu works just fine.
If You really need a 'pure' app, You can create a 'kiosk' - version using FM Advanced. Kiosk means a special 'interface' for non adminitrator accounts
I tried to include a screenshot, but its not possible from an iPad...