Logger modules support and fhttpd-log logger that uses it.
Memory limits for requests and log queues. For a long time fhttpd had no support for automatic mapping of user directories. Also fhttpd can be configured to use user's userid to access those files, run CGIs and modules. Userid 0 is the exception from this rule, module can run as it only if explicitly configured for that, and automatic mapping does not work on usernames with userid 0. Default configuration is to never pass passwords to modules and scripts.