both my fibaro dimmers work fine with the custom code that i believe is in this thread, i added a new one lastnight and that seemed to add with a standard fibaro dimmer type that smart things added but that didnt work at all. i changed it to the custom one and it worked again.
but it would be nice if smart things had one that worked b default with all the options working.
I had to setup my device type to work with toggle switches and the diming times and such all in the code, but it would be nice to be able to adjust this stuff from the app. they are really great dimmers