Unfortunately, I keep constantly dragging things, when I intended to click them. This includes elements in non-KDE applications like Firefox tabs, vscode tabs, etc..
Firefox is especially annoying, since dragged out tabs become their own window.
KDE apps work just fine, I don’t grab windows or drag Dolphin tabs on accident. These have a more than generous deadzone.
Plasma itself is extra nice, on window-top-bars, press-time also matters, and there is even a second deadzone before a drag would actually un-maximize a grabbed window. 
It feels like Firefox has a deadzone about half of KDEs, and in vscode it’s about two pixels.
Is there a way to set a deadzone for mouse movement, before a click becomes a drag, for non-KDE apps running under Plasma?
I have a suspicion that this will be extra difficult for electron based apps, like vscode, discord, telegram, etc.., since they all behave wildly differently, at least on my system.
My setup:
Plasma 6.5.3 Wayland on Archlinux, proprietary Nvidia drivers, Linux 6.17.9-zen1-1-zen.
I have three 4k monitors, set to 150% dpi scaling.