From the current online help for the SpinIncrement Property:

“A special string value of "log" is supported for numeric types where the editor's value is incremented in an accelerated fashion when the mouse button is held pressed over the spin button for a certain amount of time.”

This is a great feature, but it only works for the integer part of the number. Thus the start behavior is equivalent as SpinIncrement=1.

Now in real word application there are a lot of numbers which have to be incremented with small fractional parts e.g. 0.01. For fine tuning but to reach the adjusting range need an accelerated incrementation mode.

Please adapt the “log” SpinIncrement also to the fractional part of a number.