One irritating thing that is quickly fixed.
The posts column expands to fill much more of the screen than necessary, so much so, that changing a mobile to landscape gives no extra room for the thread title.
Fix:
Currently on a <td> containing the thread title you have a class of .mobile-truncate which has…
.mobile-truncate {max-width:300px; width:300px}
Delete both of these, or alternatively fix the width of the posts column to pixels.
…although personally, I don’t understand the logic in not allowing the title to wrap.