Hello!

1) There's no configurable keyboard shortcut for Klipper. I found
default Ctrl+Alt+V. One can even change it in "System settings > Shortcuts
and gestures > Global keyboard shortcuts > Plasma desktop shell > Systemtray-Klipper-N". But everytime klipper is closed and opened again
configured shortcut gets reset.

2) Klipper popup menu doesn't close on Enter key. One can pick clipboard
item and close klipper menu with mouseclick but cannot with Enter.
Enter just does nothing.

I think 1 is a bug.