Thanks for a great tip Grey!
I've always used MS mice but never bothered to install the Intellipoint software. I've also had problems seeing the map detail in the game (old guy here

apy: ). It's not a problem on my desktop where I've got the 24" widescreen but I also play the game in bed on my laptop. Till now, my solution was to change the resolution on the laptop which worked but reduced screen the real estate and just didn't look as nice.
After reading your post, I grabbed the latest Intellipoint software and mapped magnify to my middle button like you did. Works like a charm. Now I don't have to fiddle with my rez and have to constantly rearrange my icons after playing AACW
