Nigel,
you only need and ssl module if you want the css to decrypt the traffic in order to make loadbalancing decision based on the http data contained in the encrypted ssl data.
For example, if you want to check the url or do stickyness based on a cookie.
All this info is encrypted in HTTPS, so this is when you need the ssl module.
If you don't need this feature, you can simpply consider https as normal tcp traffic and loadbalanced based on the tcp destination port.
Gilles.
