Boogie - I dont think anyone could make an accurate tool to see if you are sandboxed - of course that also requires that you believe a sandbox exists
Since I dont believe that it exists and that some people that have gotten in to the SEO game in the last two years dont understand how Google works - they think there is a sandbox when its usually something completely different that causes problems with their site - its just an easy blame game to play
If you are having trouble with a specific site let me know and we can take a look together and see what can be done