It is not possible to create a screenshot app that runs on an unrooted phone...we have tried a ton of angles there.....we just updated the auto notification app to also eliminate the LED as well....we also dropped the price...
We also just released:
Application Speed Loader for Android
That is free....we have about 5 more apps in development
I am not horribly concerned about the warranty if my phone goes borked after rooting, which is why I haven't rooted yet because I just got my phone a couple weeks ago now if we were talking about a year or more then it wouldn't matter to me.
That is not the main reason why I have not rooted, its all about time and effort. I cannot believe Google being as opensource as it claims has put limitations to screenshots without rooting there are other phones such as blackberry that can do this without being rooted or hacked.
I have a friend who has a non jailbroken phone who can do screenshots too, Google thinks its a security risk? Perhaps it is, the users need to decide for themselves what risks they want to take. You can install 3rd party keyboards, those come with warnings that they can keylog and that I should make sure that the kb I am installing is from a trusted source.
I am really going to consider Android next time and maybe jailbreak an iPhone instead of Android when I want another phone next year because I simply refuse to use AT&T Google doesn't need my business if it limits the fact I can't share what's on my screen without having to root.