There is a little known configuration reference in the documentation folder where Wowza is installed, that I’m sure you will find interesting generally, and has this info on ClientTimeout and IdleFrequency:
ClientTimeout is the time in milliseconds the server will wait before shutting down a non-responding client connection. IdleFrequency is the time in milliseconds between idle events. For basic video on demand streaming a value of 250 milliseconds will provide the best reliability versus performance ratio. For live streaming a value of between 125 and 250 milliseconds is more desirable. It will increase the frequency at which media data is sent to the Flash client. If you adjust this value, be sure to also adjust the IdleWorkers/IdleFrequency to a value that is at least four times smaller.