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This is one feature on my wish list for KDE activities under Power Management. The idea is to be able to have an activity setting that could disable screen locker/saver even if it is set under Display and Monitor. You could call the activity, "Presentation" mode.

A B|C
----|---
0 0|1 screen locker disabled
0 1|0 screen locker enabled
1 0|1 screen locker disabled
1 1|1 screen locker disabled

F(AB) = B'+A

Or

A B|C
----|--
0 0|0 screen locker disabled
0 1|1 screen locker enabled
1 0|0 screen locker disabled
1 1|0 screen locker disabled

F(AB) = A'B

A represents the activity status of "Presentation" (Power Management) and B for Screen Locker (Display and Monitor).

B = 0 sets screen locker off
B = 1 sets screen locker on
A = 0 sets the screen locker to B
A = 1 sets screen locker off (even if enabled under Display and Monitor)

What do you think?