Of course, anything is possible, but I wouldn't expect to see anything like this in Blockland. The way shadows are rendered, it requires a high end graphics card to process. Adding baked shadows would require a second implementation of shaders running concurrently with the first that would display static shadows, something I doubt Badspot would do. The second thing is that shader pixels are much smaller than bricks and would take a while to ghost to clients, possibly exceeding the network packet size due to raw count. If you assume a single brick spawns 10 shader pixels on average (a very, very conservative estimate) then a build with 30,000 bricks will exceed the network packet limit.
Sorry, but I don't think this will be coming to Blockland.