Comment 10 for bug 132456

Also please note that reverting to old kdesu will reintroduce lots of bugs, as it can't use specific sudo settings like NOPASSWD options or allwing specific command to a user/group...
You also can disable the password caching in sudoers by setting timestamp_timeout to 0

Testing this would also be very interesting as this would eventually prove that the problem is in sudo and not kdesudo.

Theorically, with this setting, kdesudo should always ask for a password.