As I see it there is lots of room in that column, at least on my forums. And it wraps fine anyways for lower screen resolutions.
Anyways I found it. In case anyone else searches for it, it is in libs/functions_forums.inc.php. There is a variable there "subject_max_length".
Thanks for old link above Ruben,
As I only have Left menu island, I don't really care about Right menu Island (I just don't agree with them and feel they're bad interface design for Roman language which reads L-R, Top to Footer). I'm happy to fill the Last Post space with extra character count instead.
Thus, have expanded the default from 26 to 46. PERFECT!
Exactly what I'm after.