You can create an Android home screen shortcut to their website. Then you can easily have access to all the sensors. No widgets. But since you can upload to a lot of different services, perhaps one of them has a widget. Other online services though don't show extra sensors.
Read up on this forum on the GW1000 as it is the same thing. That particular kit is like a GW1001. If you want separate components you could look at the Ecowitt GW1002 or GW1003.
You can mix and match sensors from Ecowitt as long as you match the frequency of Froggit which is 868 MHz.