Turn on 'Stupid Site Mode' if the site you are using
limits the length of passwords they accept.
You should strongly consider emailing the site owners
and requesting that they allow unlimited length passwords.
Sites that constrain password lengths are being irresponsible
with your data and you should demand that they take security
more seriously.
Premium Paranoid can remember this setting for you for
all the different sites you use, making dealing with
these stupid sites a little bit easier.