Proposed changes for PIG Mod v0.82:
Please post your comments of support or disapproval of any changes you care to talk about.
Proposed updates of incorporated mods:
Not updating BBAI to v0.83 yet because it has a CTD bug in it waiting to be fixed
Update BUG
Not including BULL just yet.
Unofficial patch version 1.40
Global Warming mod version 1.10
Drill promotions:
After playing TC01's Final Frontier Plus mod I've noticed the promotions that are equivalent to drill seem to be well balanced. There are 3 first strike promotions, each that give +1 first strike and 10% less collateral damage.
In BtS, with the four drill promotions a unit has ~3.5 first strikes. I propose changing every one of the drill promos to exactly 1 first strike. This will be a slight boost especially to Protective civs. It is a slight nerf of Drill IV but I believe that once you already have a unit specialised all the way to drill 3, the extra first strike available with drill 4 is still worth it and it also opens up commando. For PRO civs it will be possible to get Commando at 17xp.
I'm pretty sure someone suggested this method way earlier in the thread so I apologise for not having gone with it earlier.
Also note the 20% collateral reductions for d2, d3 and d4 and the +10% vs. mounted for d4 are left unchanged.
Early religious techs, buildings etc.
Proposed changes: (note everything I suggest is in addition to existing features unless stated otherwise)
Temples: cost reduced to 60

from 80 and priest slots changed from 1 to 2.
Monastery: +15%

instead of +10%.
Organized Religion: Medium Upkeep instead of High.
Theocracy: Unlimited priest specialists.
Priest specialist: Now gives 1

2

instead of 1

1

.
Divine Right: +1

for priests.
Missionaries: Cost reduced from 40

to 30

.
The monastery is probably the biggest change and I am wanting to get some opinions on it. It should provide a good alternative to going with the library. The library is still a stronger build for science mainly because of its scientist slots.
Multiple monasteries can be built, each giving the bonus so it might be possible to squash a lot of religions in your capital and go crazy with the monasteries. I don't see why this would be too much different from what was possible before though. Supposing you manage 3 monasteries in your cap for example, we're talking a 15% bigger multiplier than in BtS. This is still fairly modest but decent enough that multiple monasteries may well be worth your while.
Colosseum:
If temples are reduced to 60

, then I think colosseums should be boosted a little. I suggest changing their melee bonus from +1xp to +2xp.
Subs:
I suggest giving both submarines and attack submarines +1 first strike chance.
Honestly I'd rather someone make a better suggestion because I'm kinda getting sick of adding first strikes to units to make them a bit better. I could change their base strengths instead... Any suggestions?
Battleships:
Require Artillery technology.
Grenadiers:
I suggest changing them from base 12 to base 13 strength and increasing cost from 100

to 105
Machine Guns:
Cost increased from 125

to 130

. Otherwise I make the grenadier->MG upgrade path cheaper.
Explorers:
Give them the ability to attack. Reduce strength to 3, give them +50% bonus against barbs. (they're not likely to ever encounter animals I don't think.)
This will finally let you do something about those barb huts in the new world that are guarded by barbs.
I can't think of any balance problems off the top of my head, that would be a result of this change. Let me know if you can think of any.
This is basically the suggestion JujuLautre made a couple months ago.
Great Wall:
Cost increased from 150 to 250. This may be increased later to 300 depending on feedback.
Environmentalism:
+2

from Recycling Centre.
Flood plains
Flood plains are not removed when a city is built on them.
This one appears to already be in the mod and I didn't mention it. Can anyone confirm this in their game?
More modcomps:
Route Air Bombing
I like the look of this one and it looks like the AI's handling of it has been looked after enough to qualify for merging into PIG.
Obtain gold on disband if the AI knows how to do it.