Slitherine

I haven't played for some time and got a new mouse (G402) meanwhile, but noticed now that the scroll speed of the mouse-wheel is too fast in the unit-purchase screen. It jumps about 4 rows up and down skipping units between. This is uncomfortable with unit types that require transports that limit the purchase screen to only two unit rows. Using the scroll-slider is the only useful option there.
Changing the mouse settings of Windows didn't change anything in the game. A smoother, slower wheel-ride in the purchase menu there couldn't hurt. Zoom-speed of the map with the wheel is fine.

ok, lets try and rule out hardware first, as it's not something i have an issue with or been reported as such,

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Try the following:
Delete the Settings folder that can be found in the Windows documents folder at:
...\Documents\My Games\Order of Battle - WW2
Run the game and check if the issue persists.

Deleting the settings didn't help. This doesn't look like a problem on my side but rather the game's coding. And maybe I've posted such suggestion is the wrong forum or does wheel-scrolling in the purchase screen behaves differently for someone else?