Hi Erel,
I've been successful using SLC Tool for creating a B4J library(Using @DependOn(values={"jfxrt"}) ). I need to tell you that default folder which save the library is always point to the customB4ALibs,it should has option to save the folder between customB4ALibs and customB4JLibs .
and the jfxrt.jar file should attached with B4J 's lib as default. (My English still be bad)