/usr/share/kde4/config/kcminputrc is in plasma-active-default-settings 1:0.4-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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update_info=mouse_cursor_theme.upd:kde3.4.99
[Mouse]
cursorTheme=plasmamobilemouse
[KDE]
StartDragDist=16
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