f5 sharepoint tenacious session issue

What we need is a proper solution, I'm sure there's more people than just us here that have wanted to run Sharepoint via F5 with the security levels that ISA provided maintained.

F5 support suggested I investigate adding Javascript to Sharepoint which would erase cookies on "onbeforeload" which might be doable but then do you want to modify the application when you know the cookie is set from the F5?

What you'd need is an irule to see if you had any sessions open and if not then delete the Sharepoint specific cookie (Since I dont think you'd be to popular removing all cookies from anyones machine).

If I come up with a solution I'll be sure to post back..