If you look at the text of the preset, there's a line:
//@param1:size 'text height' 0.05 0.01 0.2 0.1 0.01
The last parameter specifies the step size. Try changing it to 0.001 rather than 0.01, then hit Ctrl+S/Cmd+S.
(the parameters after the labels are the default, minimum, maximum, center, and step size -- you can get more information on this by clicking in that window and hitting F1).
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