I would like to suggest one thing that Stopwatch option in the post should be a bit easy one like the one used by beatthegmat Although, Stopwatch currently used is nice but most of the time people don't use it and maybe it's because it takes a lot of space in the post. There should be only an option in such a way that when someone clicks it while posting the questions it would appear as a heading below "Post Subject" location.
I think implementing it that way would help people use it more frequently and practice questions posted in timely manner.
"Don't be afraid of the space between your dreams and reality. If you can dream it, you can make it so."