Nokia's hack is to swirl clockwise or anti clockwise which 1) takes longer 2) is a novel movement/gesture normally not made (circles) which might be related to that it doesn't work properly (not always detected its supposed to be zooming).
My mouse requires 2 fingers at least. I find your statement hilarious given Macs for a long time only had 1 mouse button. a traditional trackpad or trackpoint as found on a ThinkPad also requires 2 (1 for pointing, 1 for clicking) whereas there is less movement by the hand in the case of newer ThinkPads as well as newer Apple devices sporting one.
Nokia N8 has a solution for this which is provided in selected countries (e.g. Finland). Since I'm already using a bare finger to interact with N900, I wouldn't mind being forced having to use a bare finger (ie. a capacitive screen).
The latest Nokia devices seem to have a capacitive screen, including the new N-Series flagship N8. So unfortunately for you it appears Nokia is drifting away from resisitive. Same happened to Palm, Apple, et al.