One drawback of Live's drumracks is that there is an option "Audio To" but it is greyed out and so can't be used. But I found a way to get individual outputs in drumracks. This can be handy if you want to use multiple hardware outs.
First create as many return tracks as you want to use hardware outs.
In their I/O section select "Ext.Out" and the output of your choice.
Next go to your drumrack. In the bottom left corner there are three buttons: I-O, S and R. Activate them.
Now rightclick in the Chain List and create a return chain for every return track.
In the "Audio To" of these select the return tracks.
In the mixer section of the drumracks there are now send knobs for each of these return tracks. Decide which track you want to send to which output and turn it's send all the way up. Mute the whole drumrack.
There is another way to do this. In the chain list select the tracks you want to send to an individual out on your hardware device. Right click and select "Group". Repeat this for every output. Now create an audio track for every output. Set its "Audio from" to the drumrack and select the individual groups you created (propably the "Post FX" item). Set the "Monitor" to "In" and select "Ext. Out" and the output of your hardware device you want to use.