Rod, sounds like you have a really fun mooring arrangement :wink . Wonder if it would be easier with twin engines? Maybe, at least up to a point in the wind.
I don't single hand often, but when I do, I frequently will use a stern tie, (easy and quick to do in the cockpit) and then put the port engine into forward at idle as was mentioned early in this thread, while tying the bow line, or other short docking tasks. (Oh, the port OB is on because we generally tie to the stbd)
As to position of the "necker's knob" Seems it would need to be opposite side of the throttle and transmision levers, maybe 10 o'clock or so. Have considered one but it seems to look more like my old tractor days than nautical. Maybe David can turn me one out of madrona, to look more boat like :wink
Harvey
SleepyC