Sorry for the lack of progress on this one... It hasn't been forgotten, it just got pushed a bit down the priority list.
I was intending a significant rewrite of the message logging, but there is something we can do in the meantime.
I have attached a plugin for you (unzip to the plugins folder).
This adds a new Plugins menu item : MessageLog Copy
When selected, all text in the message log will be copied to the clipboard.
I hope this helps!