Update: Ksuperkey is in the Korora repo now and included in Korora Xfce 24.
One of the restrictions in Xfce is that you can’t use a key as both a shortcut key and a key modifier. I have often seen questions about this particularly as regards the Super (aka Win) key. It is often set to open the menu whether the default menu or WhiskerMenu is used. If it is also used as a modifier, i.e. in a combination with another key as a shortcut, the menu will be opened as well as the action called by the shortcut.
A question from another Korora team member reminded me of Ksuperkey and looking at the Github page for the project I noted a comment that while it was written for KDE it should work in other Desktop Environments including Xfce. That sounded like it was worth checking out.
Unfortunately Ksuperkey is no longer packed for Fedora 23 so can’t just be installed in Korora. However it is simple to build. I followed this guide, replacing yum with dnf, and it worked without any issues.
If used without any options Ksuperkey calls alt + F1 which in Korora opens the menu by default. I removed that shortcut as I use whiskermenu. In Korora the Super key is used to open WhiskerMenu so in Settings – Keyboard – Shortcuts I edited that to use Alt + F1. Next I ran ksuperkey from alt + F2 and tested. I had previously configured some shortcuts to open applications using Super + other keys so I could easily test. The applications opened and the menu didn’t appear. When used by itself the super key opened WhiskerMenu. Exactly what I hoped to achieve and what was promised.
Lastly I added ksuperkey to Settings – Sessions and Startup – Application Autostart so I didn’t need to run it manually each session.
Ksuperkey adds useful and needed functionality to Xfce and probably other Desktops and is a worthy addition. It has a number of options that can tailor its operation to different situations, see the Usage section on the project page. Don’t be misled by the name, Ksuperkey doesn’t have a bunch, or even any, KDE dependencies that will be added to your system. Its name merely reflects it’s heritage.