I have a Rev 2 rear brake light loom, now how do I rewire my Rev 3 ADM to light up with 4 brake lights and 4 parkers? I'm sure many has done this mod. Been looking online and it seems to be only UK owners modding with rear fog lights which seems a bit different to my current situation.

I did mine (JDM rev2) by rewiring my original harness to suit how I wanted it to look.   I think from memory, as I did this about 8 years ago, I needed to get another plug to suit the duel filament bulbs for the center lights.

From memory The JDM 2's are quad lit, whilst the ADM 2's are dual.
When I did mine (JDM) it was a simple case of using the original wiring harness and light bulbs. I did have to extend the reverse lighting wiring to accommodate the extra distance of the new reverse light fixtures.
The original bulb seats also fitted in the new tail lights tho it took firm gentle insistence on my part to seat them correctly.
These sites may help.  http://www.mr2.com/TEXT/91to94taillight.html
                                    http://mr2.noegruts.com/t-lights/install.htm

I can't remember which way but mine was only dual lit on either parker or brake then quad the other.