Is there a way to unlock all civs from the start ? I mean to play them from the start ? Me and my friends want to start at the same time, we don't care about the AI players, just the civs we want to play.
I know we can switch later, but playing for example China/Japan/India/Mongols from the start would be better.

no, you can't

Ah too bad :/

Thanks for your answer Rhye.

Sure you can! On the main menu go to Advanced -> Unload Mod then start up multiplayer.

Well, we wanted to play this mod, not unload it ;-)

Well, if you're going to be picky...

Well, if you're going to be picky...
lol! anyway...

I haven't tried this, but you could try and change the tBirth array in the Consts.py file. It should be in
C:\Program Files\Sid Meier's Civilization 4\Beyond the Sword\Mods\Rhye's and Fall MP\Assets\Python\

With the player IDs going down as following

egy
ind
chi
bab
gre
per
car
rom
jap
eth
may
vik
ara
khm
spa
fra
eng
ger
rus
ned
mal
por
inc
mon
azt
tur
usa
in1
in2
nat
cel/byz
bar

No idea if techs are affected, you'd probably have to sort that out too otherwise it could be a tad unfair if America started in 3000BC with Gunpowder...

Well, you can play the Earth 18Civs map (or something like that) outside the mod. It's almost the same, just without UHVs, coded events, and stability. But it went horribly unbalanced for me.. I played China, my bro Japan and we went far ahead of the rest of the world in technology.. reaching paper in the 1st century :P