This is an example of why democracy doesnt work for everything. You might sit down and carefully choose the parameters for your program like the bitcoin developers did only for people to come use your source and max everything out like if designing a coin was the equivalent of using gameshark to get infinite gil.
It was made open source for the very reason that it could be improved upon, in the future, when networks and computers became better.
That, and it would be harder to shut down multiple coins.
Yeah like Firefox is open source so people could change the icon image and about:config for backspace and call it "Flamefox: the ultimate opensource browser. Way better than Firefox"