Hi again,
after Starkiller Aces's great input and other appreciated help here, I want to give something back and share, what I did with the key bindings.
I actually use -if it makes sense- all three macros of a key (tap, hold and double tap).
So here is my current setting; I want to try other options though, because I have to look up the bindings quite often, so I am working on a better way of sorting them.
(Third binding of #5 is "Resupply")