Currently each post is made up of a table three columns wide:

|NAME AREA-------------|-STATS-|-EDIT/REPLY|
|-------------------POST-------------------|
|-------------------POST-------------------|
|SIGNATURE-------------|----REPLY/QUOTE REP|

I see that on Edmund's screen, the SIGNATURE area is made quite small, since it can only occupy as much width as the NAME area. This could be changed, so that the signature can use up some of the "unused" space to the left of REPLY/QUOTE, but I don't know if there would be any negative side effects.