This is a picture I took of the insides of the TCS switch (MT).
Sport/Snow are the two gold circles in the center. As you can see, the traces go to the two empty pads towards the right. The MT has 7 of the 9 pads connected - illumination positive, illumination ground, switch common, TCS switch, VSC switch. The AT has the additional 2 pads connected to Sport and Snow.
In theory, if one was to get the AT switch module, you could insert pins into the harness and use snow and sport for alternate functions, but you'd need to make sure that the common contact for all the switches will play nicely with what you're using it for (I do not know whether it's a ground or a positive, or if it will cause problems if you connected it to a radio pin)
I did also observe that it may be possible to jury-rig the MT switches to allow usage of the center switch. The housing and PCB are the same, and the MT center switch blank is installed on a pivot point same as on the AT. The only difference is that the switch blank is so long that it won't freely rock back and forth, and it doesn't have plastic legs that push down on the pads to short out the contacts. It doesn't seem like it'd be all that hard to mod the MT switches so that you could press the center blank and have it do something else (i.e. radar detector mute, radio controls, toggle some lighting, etc)