With so many Window Movement/Management functions available in the Settings - it seems logical to have one that would also minimize the window to the system tray as well.
I realize that's not really "normal" window management, but it'd be cool nonetheless.
We've just released DisplayFusion 6.0 Beta 6 and there's now a Function on the Settings > Functions tab called "Minimize Window to System Tray." The default key combination is Ctrl + Win + T, and you can assign it to a TitleBar Button by selecting it and clicking "Toggle TitleBar Button."