@jhuls you can set it up in the JSS as a managed preference (Managed
Preference > Internet Configuration > Default Web Browser) and then if
not done already setup the iMacs in that lab into a Static Computer
group and just scope the managed preferenc...
Had the same problem with v9.01 and iOS7 clients :( To resolve it you
need to update the JSS to at least version 9.12 and then make sure the
iOS device does an inventory so that it can update its self service app.
Should work after that