I take a similar approach to Focus with regards the aquaduct, continuing to cycle until I get close to someone (unless it is a police officer, in which case I'll get off my bike since one of them has told me off before) and then moving right up against the handrail to give them as much space as possible to get by (more than if I was pushing my bike on foot). Most people seem more than happy enough to walk by me like this. It doesn't stop someone occasionally saying "the sign says that you should get off your bike" or similar, to which I generally reply "I know". No one has replied to that, although I have mentally rehearsed my "I can actually give you far more space this way" come back many times!
I don't go out of my way to avoid joining the aquaduct if people are on it already unless I see that someone is just about to exit before I join it. I ring my bell prior to joining or exiting just in case. If I catch up with someone heading in the same direction as me I will just slow right down and roll along quietly behind them.
Most pedestrians seem happy to give way to me although I will happily cycle by them if they offer, although I sometimes get a little nervous depending on how much space they have given and how random they look for fear of being pushed in, not that that has happened to me...
The thing that I am most unsure about is giving way to other cyclists who have remained on their bikes too. I generally go with the strategy of giving way to anyone who was already on the aquaduct before I had joined it, although clearly not everyone shares the same viewpoint because some cyclists will basically try to force their way by regardless of the situtation which can be hairy!