Adding a +1 vote for the ability to control this. It just doesn’t make sense to be working, and suddenly find that you’re logged out. I believe that you do lose work in that case, unless you are able to do something fiddly with multiple logged in screens as I usually do when this happens.
I also believe the lockout arrangement gets confused if you change IP addresses. I’ve had sudden lockouts around times that a local ISP ‘adjusts’ things, and also on short travel between different wireless access points.
The upshot of both of these issues is that I have to run CPs in cookie-only authentication, to avoid being logged out quite often when least expecting it.
Regards,
Clive