I agree with Patrakis and was about to post it myself: I think that gradients are an important feature / sheet effect which is missing.

Furthermore, as I mentioned on the Profantasy Community Forum, I'd like to see the new light entities and sheet effects introduced in the July issue of the Cartographer's Annual 2008 fixed. When exporting a map at a high resolution and rendering the areas in which the light entities have not directly been placed, CC3/DD3 "forgets" the light beams coming from other parts of the map and, hence, doesn't apply the effects.

Also, instead of areas that are not lit automatically becoming completely black, it would be nice to be able to add a transparency to that black layer. In that manner, cartographers could easily create night versions of their battle maps.