Wouldnt it be better for leader's experience to be tied to the amount of men killed? Or perhaps maybe a mix between victories/men killed.
Also if such option is to exist, please give us the option for "classical EU2 warfare". Would also be good if you could implement this "idea" only for human-to-human wars for multiplayer purposes (that way human players wouldnt be able to farm the AI in order to get strong leaders).
Would also be good if we could edit the parameters, whatever they might be.
Name of leader and his stats (skill points) have to be a variable but in EU2 it is not, so:
We should create list of id with all combination of stats for the same leader 1-1-1-1, 1-1-1-2, 1-1-1-3 ... x-x-x-x according to max from DP and historical leaders, because leader do not change but only his skill +1. Random point for lvl should be fair and balance game. So if leaders ID is 10000 the next ID (+1 from lvl) of he same leader should be 10001-10004 (random from this ID will be the same leader with lvl +1 etc.)
Ok for example:
for more balance for non-historical:
- lvl 0 + win 20~40 battles for lvl 1 (random)
- lvl 1 + win 40~60 battles for lvl 2 (random)
- lvl 2 + win 60~90 battles for lvl 3 (random)
for more balance for historical:
- lvl 0 + win 15~30 battles for lvl 1 (random)
- lvl 1 + win 30~50 battles for lvl 2 (random)
- lvl 2 + win 50~80 battles for lvl 3 (random)
or we can replace historical to non-historical (we need test it because historical leaders learning pretty fast

)
- max exp lvl 3 for non-historical
- max exp lvl 5 for non-historical
- leaders don't live forever: chance to die in battle 1~3% or more
Other problem is time: what does mean winning 40 battles in 100 years?
Yes time is problem now. This mean 40 enemy leaders have to die for +1 lvl up on our non-historical leader in worst case (20~40 battles for lvl 1 random) (enemy do not retreat)
My numbers are too high (it is example only / proof of concept).
/ if id enemy leader die -> win battle +1 /.
Leader's experience tied to the amount of men killed would be good too

We have now few ways to create exp leaders
Edit:
Today I heard that HoI units gain exp. I buy HoI but I never play it so I don't know how exp working in HoI
