That's kinda like using a sledgehammer to tap in a nail...

Shutting off all the alerts isn't really the answer, proper tuning is. Your global line should be configured to reflect the majority of the http server present on your network. Then any deviations from that need to have their own lines. (Different ports, different server types).

Shutting off the alerts, yes, gets rid of the alerts and just makes http_inspect normalize traffic, however, you are not seeing some of the benefit of http_inspct, in that it has its own alerting!