I was working on integrating my mods in MP before my break, but there are a lot's of things to test like updating the DB values for MP (the formatting is not the same in mods and in the base game), what happens when modifiying gameplay element with Lua in MP (like creating an unit), etc, etc...
I've already seen that thread and I hope that Jaii der Herr will found a way to integrate such mods using his app, but that won't be an easy task.
But just as a side note, I've made Cultural Diffusion loading in a MP test game back in October (launched with only one human player) with minimal change to the core files (two: a civ5pkg and the ingame.lua file), problem is that you can't install the mod like other, an installer or a manual installation in the game assets folder is required.