Hi,
Yes, you can specify separate sensors for wind, rain, temperature, and humidity - yet have them all push data to a single Weather Underground, CWOP, etc. station.
Say you have the 5-in-1, but want to use a separate temperature sensor in the shade.
As a bonus, you can even post an extra temperature/humidity sensor data to the "Soil Temperature" and "Soil Moisture" (humidity) values for your station. This would be if you want to monitor your living room, garage, barn, shed, or whatever via Weather Underground. Note that WU doesn't currently track historical data for these values, but you can monitor them nonetheless.
Kevin