I did. Twice. Need to pay attention next time, I guess. lol
Well, I went back through the thread and I now realize that though the info is there to do what you want to do, it isn't set-up like a tutorial. So, if there is something that isn't made very clear, just let me know and I will see if I can explain it in more detail.
The short answer is Yes, you can connect the DM10 and the Trigger I/O together with a midi cable and add the extra crashes and toms you want to do. Nothing should change on the preset kits as far as the basic DM10 studio set-up is concerned. The midi notes that you will need to program your trigger I/O to are past the notes used for the DM10's inputs. Those note already have sounds assigned to them, but chances are you will want to assign different ones to it.
Once you get your DM10 set-up and you want to hear the sounds in those locations, hit the INST button and then F1. You should now be in a instrument select mode. Using the scroll wheel, scroll until you see "MIDI#37". That is the first midi note that you can access with the Trigger I/O. There are 34 additional midi notes you can use past MIDI#37. All of which have something assigned to it, but can easily be changed. Keep in mind, you will need to set the Trigger I/O to that midi number to play that instrument and make sure the your Trigger I/O and DM10 are on the same midi channel (channel 10). Out of the box they should already be set-up that way.
I hope that helps or at least gets you started.