travelbug,
It's very difficult to do this with the mcmodule, because of the timing of the pulses required for the DHT 22.
You'll notice that for all these sort of devices (one wire, like the dallas protocol DS18B20) in the Arduino libraries, the signals are "bit banged" - ie the lines are set high, then low with a specified interval (timing), you then listen on the line for the response from the sensor, and decode this as bits.
With the mc modules, they use an RTOS (Real Time Operating System) - which is how it seems to do many things at the same time. One of the limitations of an RTOS is that you are not able to send signals (ie bit bang) with precise timing. This is because the underlying RTOS can interrupt at any time whatever you are doing to service a routine with a higher priority (say service the radio for instance).
So, although you think you are waiting 100uS between pulses, the actual duration of the pulses can vary, due to other interrupts (which you can't turn off, unlike an Arduino).
Having said that, the timing requirements for these (and dallas) devices isn't that fast or precise, so you might be able to get them to work (even with the timing variability). I haven't tried yet, as they draw quite a bit of power when measuring (and a bit in standby) and there are other options out there (check out the HDC1000 or the Si7021-A20 for instance - Adafruit has break out boards for some of these, and they are quite cheap).
Another option would be for the mc module guys to build in the protocol(s) to the firmware (as they can control the timing/interrupts), but this is probably not a priority for them, especially given the power draw of these devices, which is not really compatible with a low power/battery powered device.
The I2C device's I suggested are only a couple of $ more expensive, but draw less than 10th (or less) of the power. That's 10 to 100 times the battery life!
I2C is supported out of the box by the mc modules, and lends itself handily to your stated objectives, at fraction of the power 4 DHT22's would draw.