First off welcome to the community zenocide, and thanks for the suggestions to make our server better.
I remember playing fy_dustworld back in the day,, good map indeed. I cant seem to google a DL of it, i can only find a CS:S version,, lame. you can attached the .bsp file to a reply post 
Anywho, i think having that map and snow in the rotation would get a bit repetitive since they are for the most part the same map,, however we do a custom map night ever few weeks, we call it 1.6 FunNight.. anywho we can definitely get it up on the server and try it out during a fun night and if its successful, and the community wont to swap snow for dustworld i definitely dont see why it cant be on the server.