Regarding the issue above:
To easily add new shortcuts to the window: click on the tray icon so that both the options and shortcuts window appear, now you can drag new shortcuts there. Close the options window when you are done.
Sometimes windows shuts down this program to quick so there is no time to save your shortcut configuration. To prevent this, exit the program manually by right-clicking on the tray icon.
This program is developed for using with the good old windows desktop applications. Windows store apps are running in a sandbox that is almost inaccessible from normal windows applications, so that is why they don’t show an icon.
thanks for the feedback!