Update: I have the TCM-2000 transmission controller installed and operational. I have to say, the wiring was a bit of a pain but in the end having control over the shift points has improved the drivability incredibly! I have the shift points tuned better than the factory did before I did any modifications to the van and I only spent 2 hours tuning. I am very impressed with the versatility of the unit and the software.
As for the paddle shifters, I have decided to mount them on the steering wheel. After putting together the 3D model of the steering columm/wheel assembly I just didn't feel like there was enough room for a bracket to fit between the steering wheel and the turn signal stem. Fortunately, PCS has provided a wiring schematic for a few unique solutions given that you cannot easily add wires to the steering wheel given the clock spring.
Option 1: Tap into the horn wire to send a signal to the TCM-2000 to up/down shift utilizing paddles that are added to the steering wheel. When a switch is turned on to go into manual mode, it interrupts the horn circuit and senses the voltages coming from the steering wheel. You add two different resistors in line with your up/down paddles to send a different voltage for each signal. The transmission controller is able to interpret these voltages and knows whether to up or down shift. This will obviously eliminate functionality of the horn, so to work around that the unit can sense when the horn is pressed because the signal goes to ground. It will then use one of its' digital outputs to send a signal to the horns to turn on. When you turn manual mode off, the normal circuit is connected and everything functions as it should in a stock vehicle. (See pictures below for information on this).
Option 2: You may use the stock cruise control buttons on the steering wheel to control the up/down shift commands in the same manner as option 1. You do not have to add paddles to the steering wheel but you will loose functionality of the cruise control when you are in manual mode. I wanted to be able to use manual mode and cruise control so I am opting for adding my own paddles and using the horn circuit. (See picture below for information on this).
I will post up the exact wiring schematic that I end up using in case others on here want to do the same thing. Just a warning to anyone that wants to use the TCM-2000: If you have an Edge CTS or other OBDII monitoring system you will no longer have access to your transmission temperature or current gear display. I am going to add a universal 5V input to my Edge CTS so that I can wire in the transmission temperature gauge to be able to track this. The TCM-2000 does monitor the transmission temperature and will try to prevent damage in the event of overheating but I prefer to monitor this myself. I did end up purchasing one of their gear indicators so that I can see what gear I am in when I am in manual mode.
IMPORTANT: You will need to flash your ECU to think that it has a manual transmission. I have a Power Hungry Performance chip that I use so I had them remove the automatic transmission functions and now I don't have any check engine lights or codes.