I use dom0 as my guivm, so this changes the clipboard shortcuts to Mod4-c and Mod4-v:
qvm-features dom0 gui-default-secure-copy-sequence 'Mod4-c'
qvm-features dom0 gui-default-secure-paste-sequence 'Mod4-v'
I had to restart for it to accept the new shortcut.
References:
-
man qvm-features
“gui-, gui-default-” section. - comments at top of guid.conf