Finaly someone who would appreciate that functionality
. Now let's hope someone who knows how to create a plugin will pick this up and makes it...
Meanwhile, untill this option is available you may want to think of using Trillian. It's a multi platform client which you can use for msn, icq, aol, irc, aim and more. There is a plugin availble for the time zones (see screen shot in my original post - not in chat window "user is typing @ hh.mm hours).
Trillian can be dowloaded for free from
http://www.ceruleanstudios.com/ the pro version is $ 25,-...
You just need to know and accept that Trillian supports multiple platforms, and as a result it will always offer less functionality then the latest version of the original platform (and for that reason I want to use msn again... IF I find the plugins I need.