Basically, once a location is captured, a timer starts and begins counting until it is re-captured by another server. I think this would be a little nice addition for WvW. Since locations such as Stonemist Castle are always changing hands, it would be nice if there was a timer to show how long a server has held it for. This can set records and maybe if you held for a specific amount of time, there will be bonuses and such.
Just something to consider.