I believe you will be able to roast as it is. The blower would be for chaff collecting / cooling. It has a built in loft blower already.
Also, yes, a little more detail / info on their website would be nice, although they do have numerous youtube vids on the 6m i am betting the 2m is just a scaled down version. One of these years I will build an external cooler for mine. I use it's blower to cool them but am sure an external sucker instead of a fast blower would be much more efficient. I was thinking of possibly making a stainless tube hoopiejoo thingie and using it's own blower but as a venturi affect to suck air through a colander / container setup to cool the beans.
Aaron