To quote myself a few times from the Leaders thread:
The one civ I was surprised to not see touched was Bismarck. His biggest issue is the extreme lack of decent synergy of a hit or miss UA with two mediocre UUs. I think an easy, yet not too powerful solution would to give his forces a 5% combat boost in foreign lands (i.e. a weaker replication of the Foreign Legion's ability) in addition to the barbarian deal. His cheap landsnecht plus barb pickups seem to indicate a rolling horde playstyle (which is basically what Furor Teutonicus means), and 5% to a lot of units would perfectly synergize this.
The other idea that was thrown out there was Blitzkrieg UA - a 20% unit xp increase and/or a move after attack promotion.
I have to say, playing America with this mod, the Pioneer is fun, but for the most part, useless. Whats worse, the AI has had issues with it, where the guarding unit cannot keep up, leaving it exposed.
Here are my suggestions for America:
Replace the Minuteman(silly name anyhow) with the Pioneer. Remove any combat buffs, make it cheaper than a base muksetman and give it the ability to found new cities.
Replace the silly bomber with the Immigration Station UB
The Immigration Station synergizes well with the UA and UU, making the civ best played by boldly settling new locations once it hits Ren, and rewarding these with faster growth on the coast.
(Plus I already have Icon art for it!)