Description of problem: This diff removes the dependency of gnomecanvas from the timezone section of this tool. Not sure if this helps you or not, but it was necessary for me to do this to use it in another place. ( figured that you might be interested in it )
It's interesting but some things I have in mind with s-c-date won't let me use this here as it is... if you have the time and want to do it, you could extract all common stuff into a TimeZoneMapBase class, then have a TimeZoneMapCanvas and TimeZoneMapLightweight (or whatever you want to call it) class deriving from it. This way it would be worthwhile here, i.e. I could put all the fancy stuff in the former class but if gnomecanvas isn't available I could fall back to using your implementation. What do you think?
Closing due to lack of response.