I really don't see the need to have to cap other than wanting everything as soon as possible and efficiently. Heck, most content, with the exception of Savage Alexander, only requires a full set of Law gear. So, take your time and enjoy the game. The game doesn't even force you to do it either. :0

Plus, if you couldn't cap with the current weekly cap, it's very doubtful you could cap the cumulative cap as well.