Feature Request: New build arg so --warningsAsErrors shows multiple warnings

Currently, if one turns on the `--warningsAsErrors` build flag, then the first warning log the build comes across will be turned into an error, and the build will stop. We're trying to use `--warningsAsErrors` for build validation, but if one happens to make several invalid link mistakes, only one gets reported as error during the build at a time. We'd like to be able to show all the issues that occurred during build so they can all be addressed at once.

Something like `--showAllErrors`? Or `--stopOnError false`?