I just did.
As a side note the "source code" link in the footer is pointing to the original lamernews repo, perhaps change it to point to echojs' repo.
https://github.com/antirez/lamernews#users
Looking at the lamernews repo I see that multiple accounts creation is not really a problem. This:
"Account creation is rate limited by IP address with a key named limit:create_user:<ip_address> with TTL 15 hours."
Avoids it.
Well limiting to 1 a day does not require a change in the code, only in configuration
https://github.com/antirez/lamernews/blob/master/app_config.rb#L50
I think changing that line to
NewsSubmissionBreak = 3600*24
would do the trick.
"double karma back on downvotes on articles that are then deleted."
That is an awesome idea. I'll try to find time to mess around with the project and see what I can do.