While I feel it's probably good that you can do this through t-SQL if required, I think the idea of adding -t1222 is more than a little out-of-date. Starting in 2005 I would be using a trace to get the deadlock graph, which you can run queries against instead of reading through your logs, not to mention leaving your logs in a state that they're still legible. Then in 2008 you could have started using extended events to do the same thing as well.

It's still a bit scary changing the registry through t-SQL... Be careful and blow up personal test machines, then Dev, then prod if you're doing this. A small misstep here leaves you manually changing parameters to get SQL to even run again, and you don't know that you made the mistake until you restart services.