Parameters (real/vector) are displayed with a large number of digits after the decimal. The defaults are:
("display" is how many you see browsing the params panel, and "edit" is how many are shown in the edit textbox when you click on a value).
I doubt that anything actually kind of precision. It overcrowds the UI space and is most likely the cause of values being displayed as "67.999999998" rather than "68.000".
comparison.png [ 31.88 KiB | Viewed 591 times ]
We might also consider getting rid of the "X:" and "Y:" labels when editing vectors:
no-x-y.png [ 19.01 KiB | Viewed 591 times ]
So my questions are: what precision do you actually need? Would removing the X/Y text to save space when editing vectors be a good change?