I am the current developer for the WHI OCTGN plug-in, and I'm going to stop updating it. I would like to pass this project off to someone else, but I have gotten tired of maintaining it. If you are interested, please contact me.
At a minimum, it will need additional sets to be made as each new expansion is released. This can be accomplished with no programming knowledge, since the set files are simply XML.
There are a number of other changes that can be made to make the plug-in more advanced, but they require you to write Python scripts. I am not a programmer, didn't know Python, and still really don't, but I was able to muddle through by looking at some of the other OCTGN plug-ins (dB0's Star Wars, Doomtown, and Netrunner plug-ins are excellent examples). I have it set up to support multiplayer in a rudimentary fashion (fulcrums, dominance), but the phases are set up for the 2 player game, and the phase stepping/notification code would need to be changed to properly support multiplayer. Also, it doesn't lay out the capital boards well in 3+ player game when you use the "Setup Capital Board" function.
If anyone is willing to take over the plug in, I will provide you with the tools I've made to help automate the process. OCTGN is receiving a big overhaul on Weds though, and the old game/set formats no longer work, so some of my tools have become obsolete. I spent all my free time this weekend getting the plug in converted over to the new format, and have basically hated it so much and gotten so frustrated that I realized I don't want to work on it anymore.