Hey Frank,
The EAs have been created and validated using specific criteria. In addition, prior to downloading them, you select your options – challenge size, risk settings, news filter, etc. Once you’ve done that, the settings are automatically included in the EA and specific to your challenge and risk. I wouldn’t recommend that you change anything, but the source code is included, the properties are open so you can change anything you like. Max spread at 0 means the EA will read the spread info from the broker.
Thanks,
Ilan