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.
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.