Portal Session Timeout

Hello Experts,

We would like to configure session timeout for portal.

I came across many discussions regarding this topic.

Most of them talk about custom development.

Few have tried to use standard session timeout and logon ticket timeout but they faced issue -

'Active users are also logged of from portal after specified time.'

What I would really like to know is that isn't there any configuration option provided with standard portal?

It is very common requirement , and I see most of the consultants going for custom development to achieve this requirement.

Anyone can throw light on why this configuration option is missing in standard portal?

Is it available in latest versions?