Another idea would be: tie the number of outstanding comments allowed to the user's karma.
For those of us in non-US timezones, it would be nice to be able to post a few comments before having to wait while the site isn't getting much traffic. I would say something like 500 karma = 1 extra comment you can make before getting the previous ones endorsed.
Related to this: are there any hourly visit stats available? I currently work nights in the GMT+1 timezone, so I'll probably end up all over this scale (depending if I'm posting from work, or during the day when off...).
This could be some additional meta-info to add to the 'post stories on Mondays'-"rule"...
For those of us in non-US timezones, it would be nice to be able to post a few comments before having to wait while the site isn't getting much traffic. I would say something like 500 karma = 1 extra comment you can make before getting the previous ones endorsed.