That's a nice link!
Looking at it, it seems that it wouldn't be that hard to model the various Pathfinder techniques.
1) H2S - Just create a modified view of the regular map, so that it looks sort of like this:
http://upload.wikimedia.org/wikipedi...ay_Cologne.jpg
All you need to do is treat water as black areas, land as dark gray and buildings and bridges (or just city plates) as speckled and streaked white.
This view wouldn't be much different from "radar" map views produced as mods.
And, of course, you have a signal emitted from the plane when it has H2S turned on, which allows it to be tracked by German nightfighters carrying NAXOS.
2) OBOE - This is very similar to existing navigation aids in the game and would be very easy to implement. You have two signal beacons - one from the CAT station and the other from the MOUSE station. As long as the game detects that the plane is flying at the correct distance from CAT it sends one tone. Too far away and it sends another tone, too close and it sends still another tone.
When the plane gets near its target, the game sends the MOUSE warning signal as long as the plane is on the correct course indicated by CAT. The game then has the plane release its markers according to the signal sent from MOUSE.
3) PARRAMATTA - This is nothing more than Mosquitos or other bombers loaded with marker flares, so it's just a loadout option. It's easy to implement, since flares can be modeled in the game. Just get the right colors of yellow, red, blue, etc.
Operations with follow-up Pathfinders re-marking the target can be created using the FMB.
4) NEWHAVEN - This is just another use of the parachute flares loadout. The FMB can be used to create the full effect, with the lead aircraft dropping parachute flares and follow-on aircraft dropping marker flares.
5) WANGANUI - This is basically the same as NEWHAVEN, except that the parachute flares are dropped from a higher altitude and more of them are dropped.