At a bare minimum, we would add the wic image types to Toaster (wic wic.gz wic.bz2 wic.lzma), so that you can select them, and document in the manual that you will need to have a .wks file matching the name of the build target in the same location as the target bb file. 

A full blown wic integration might include a way of specifying partition options and generating the wks file from Toaster, and even a 'deploy' button to deploy the images to target hardware, although that might be shooting a bit too high.