When trying to capture the mobile edition of a site for viewing on an iPhone I
tried using a custom user agent string:

Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_1_2 like Mac OS X; en-us)
AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7D11 Safari/528.16

That 140 char string is apparently over the maximum length allowed by HTTrack
(which I think is an arbitrary 124 chars).  Since user agent strings over 124
characters are perfectly valid (and used) it'd be great if this restriction
could be lifted.