Transform Metrics with fractional values

I have a font with grid zero, and I am trying to adjust the RSB and LSB of all glyphs by -0.2. Seems like the Transform Metrics dialog doesn’t allow me to do that, it switches to 0 immediately. Is this a known limitation? Is it intentional? Is there any simple workaround?

The UI can’t be changed early. So the easiest would be a script.
I’ll have a look if I can improve the UI.

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