( plus some reading practice to boot)
1 and 6 are often in use. Rest is well, maybe there, but I cant say how often you encounter that. 7 is also often, but since you hear a sound, its not the gesture itself.
Sehr hilfreich! Danke!
...tapping ones forehead.....toc...toc.... ;-)))
Wobei ich das eher kenne, dass man sich an die Schläfe tippt.
(I usually know it as tapping your temple, i.e. the side of your forehead, rather than the front.)
ach das Vögelchen sitzt doch da flächendeckend :-)