Yes, it can be programmed to automatically close the battles with the wins/losses/draws.. as of right now, we just have people post in the Battle Closings thread with links to battles older than 3 weeks for them to be closed manually.

Basically it depends if the demand for that option is there. The automatic check in system was put in because lots of people were asking for battles to be closed because someone didn't check in.. as of right now, there are not that many people asking for their old battles to be closed after 3 weeks. I'm guessing they either don't know about it, don't care, or just want the 5 votes to close it naturally.