I would pay for 'kid-safe springboard' for iPhone. Basically something that lets me quickly switch to a 'kid mode' where only apps that I want my 5 year old to

I would pay for 'kid-safe springboard' for iPhone. Basically something that lets me quickly switch to a 'kid mode' where only apps that I want my 5 year old to play with are available, and maybe even disable Internet to those apps. Sometimes you just don't have their device(s) handy when you'd like to occupy them, and you don't want little one replying-to-all in email... That would be acceptable also -- lock-out of certain apps/groups. And for regular, not-jailbroken iPhones. I do realize this probably isn't possible given what Apple lets you officially access. But maybe there is something creative possible?