In a laboratory experiment on multiscale pointing, we compared one-handed vs. two-handed input for two zoom-control devices, a wheel vs. a mini-joystick with an all or none response. Using a recent method of quantifying multiple degree-of-freedom (DOF) input coordination to evaluate pan-zoom parallelism, we confirm previous work [1] showing that multiscale pointing performance strongly depends on the degree of pan-zoom parallelism. The new finding is that two-handed input and a constant zoom speed allow more input parallelism, thereby increasing performance speed.
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Bourgeois et al. (2002) studied this question.