If HTTP error 509 (download limit reached) occurs, MegaBasterd will attempt to continue the download using the SmartProxy module.
It is important to note that the download speed using proxies is very variable and depends on multiple factors outside of MegaBasterd. I can't do anything to improve that.
I hope as always, that it will be useful, but if you need a higher download limit at maximum speed I advise you to get a MEGA account.
PS: I'm looking for a collaborator to help me write the MegaBasterd wiki. ( I can't pay you with money, but I'll put you in the credits window :P )