Lightroom: Adjustment Brush: Why is mouse wheel direction reversed for feather?

The size of the adjustment brush can be controlled using the mouse wheel: Rolling it away from me increases the size, rolling it towards me reduces the size (same as in spot removal).

When the mouse wheel is used while holding the shift key, it adjusts the feather. However, it does so in the opposite direction: Away from me decreases the feather, towards me increases it.

IMHO this is completely counterintuitive and confusing. Was this intented (if yes, why?) or is it a bug?

I use LR 3.4.1 on Win XP 32Bit SP3, no special mouse driver and a Logitech MX400 mouse.
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