If you’re really triggered by this, sometimes with KDE plasma it is possible to tweak things for which there is no UI. If you can find the QML involved, you can hack it, and if it lives in C++ and is defined as a global, you can pre-load a .so with the setting you want.
(I find the 1 Hz blink rate of cursors in plasma to be anaemic, wasting 500 ms of my in zone time when I look for the cursor. There was a setting in Qt 4, in some file named something like, “TrollTech.conf”. But, a 10 line .cpp file compiled to .so and it’s good.)