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The only wiring changes that I know of would be adding wiring for the 951's real tps sensor (VERY esay) and then rewiring a bit of your harness so that everything is headed into the microsquirt rather than the KLR. Microsquirt can natively control an on/off idle valve via PWM and run a knock sensor. There are two spare ports that can run pretty much anything up to about 4 volts. So I would configure one to switch a relay for fans and the other for a boost control solenoid.
If you really want a MAF you would have to give up one of the things above, but I can't think of any reason to put a maf on the car. The VE is very robust, offers a lot of flexibility in packaging, and eliminates restrictions on the intake side. Changes to the VE will need to be tuned for if you want to take advantage of them, but the software packages out there can basically tune themselves. I had great luck building a base map and then letting Tunerstudio autotune with my wideband. The car ran like it came off the factory and would smoke tires in 5th gear at 70 miles an hour. The microsquirt also has the ability (when it has O2 signals) to adjust for a target A/F without actually changing the map. It does this on the fly when configured to. It can also target A/F and change the base map as well - this can result in a very very nice base map that will eventually not need any targeting. There are about a dozen tuning software packages. MegaTune is solid, but the UI is dated and not very "dash" friendly. Tunerstudio offers a beautiful UI, some more advanced tuning features, and can be used as a fully configurable dashboard. I ran a 7" tablet in my mazda as a live dash from tunerstudio which saved me a fortune on gauges and allowed me to tune and datalog every time I drove the car. I'll get some pics headed your way later today.
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