Version:           3.5.6 (using KDE 3.5.6 "release 25.2" , openSUSE )
Compiler:          Target: i586-suse-linux
OS:                Linux (i686) release 2.6.16.21-0.25-default

It would be very helpful if it was possible to mark multiple todolist entries just the way you can mark multiple files at konqueror. 
a.) It should be possible to delete all marked entries at once-
b.) It should be possible to make modifications which affect all selected items:
 f.i. set the same expiry date for all marked items
      set the same category for all marked items
 Properties which do not hold the same value for all marked items should be faded out gray in the modify-dialogue until the user sets a specific value for all marked items

If this is too complicated it will be valueable to apply changes to all sublist entrires.