Khotkeys allows setting the groups, depending on the active window. This allows, for instance, to use a keypad as a macropod when Inkscape is active while still using a keypad for inputting numbers in web browsers and text editors. However, it is impossible to reuse the keypad key for hotkey in a different group. This for instance prohibits users from setting keypad for use with both Inkscape and gimp. I think that this is not ideal and should be addressed.
As announced in https://pointieststick.com/2023/07/26/what-we-plan-to-remove-in-plasma-6/ and https://community.kde.org/Plasma/Plasma_6#Removals, I'm afraid KHotKeys has reached end-of-life in Plasma 6. Accordingly, all bug reports and feature requests for it must be closed now. Most of what KHotKeys could do can already be done with the newer KGlobalAccel system in Plasma 6. A few features such as mouse gestures and triggering conditions based on changes to window states are not yet implemented in the new system. These will be added in the future if and when resources materialize for them, and/or when a kind soul submits patches to implement them! :) Meanwhile, the 3rd-party "Mouse Actions" app (https://github.com/jersou/mouse-actions) may be usable for implementing your own mouse gestures again. Thanks for your understanding, everyone.