Being able to modify city building's p****enger and mail level
would open new game behavior possibilities.
Currently, commercial tagged one get X2 for mail level, industry one for half.
P****engers level is same/proportional to base level represented by /1000 of
removal cost. (or something similar to this)
For example, one can apply x5 p****enger value of base level for commercial
and 1/2 for residential to make commercial city building much more attractive
compared to others.
This will make more definite p****enger flow pattern
if certain city contain more one type among com/res/ind city building with
more same type coagulation inside the city.
Some mixture of these new parameters can create more interesting p****enger
/mail flow variation possibilities.
(new parameter like modifiable destination percentage. which we have
50% for city building, 33% for industry building, 17% for tourist attraction)
(another parameter is different city prefer building one type among res/com/ind
than the mixture of all, all the way keeping res/com/ind balance all map wise)