Add exitOnWait flag

[kfox1111]

This enables the exitOnWait behavior from the commandline so most users don't need to define two different config files.

[kfox1111]

There should probably be a bigger conversation about having all config file options also be flags. But until then, this PR will enable a pretty good savings on configuration.

[MarcosDY]

I agree we must provide more flags here... but this is a good example,
if we go for that approach, I think we may move the config parsing to another place, to simplify changing values from configs from flags...