Modding settings.txt OK for stock PBW games?

[AMF]

Ok, next set of questions:

If I make a PBW game, can I modify the everything in the "settings.txt" file and the players won't have to worry about having the same modifications? ie: can I tell the players it is a stock game, but when I begin the game can I use custom settings.txt data and it won't be a problem? I guess I'm asking if the settings.txt data is only used a startup or map generation...

And how about all the other map type data? For example, can I mod secttype.txt, quadtypes.txt, when I create the GAM and not have the players worry about it? Ie: still be a stock game?

thnaks,

Alarik