Hi, There's a duplicate accelerator in the "Focus" tab of the "Window Manager Tweaks" dialog: "f" is used both for "_Focus" and "Activate _focus stealing prevention". Please choose another accelerator, "v" from "Activate" should be a good candidate. Thank you!
Another duplicate of "f" in the same dialog, in the "Accesibility" tab: #: ../settings-dialogs/xfwm4-tweaks-dialog.glade.h:12 msgid "Hide _frame of windows when maximized" I would use "h" from "Hide".
Fixed in git master 34236925045db5bea99f3b71cac9ce56b2dbbdd4.
Your initial commit introduced another problem, but I see you've already fixed it in commit 274a448a908edd15016ecd2064c51f36c72b9b2e. Closing bug report... Thank you!