Most Unreal Engine number values have the option to scrub (slider action) to set the value. This is great to be able to look at the scene while smoothly going between values and setting values by eye.
However there are some values and times when the mouse is too coarse or too fine, which makes it impossible to look at the scene and adjust. In these cases you’re forced to hand type value after value to check the results and repeat. Examples are any of the light values or exposures, post volume exposure compensation, etc.
Suggestion: Consider what other DCC tools do since they have the same issues. Alt/shift keys possibly to scale up or down by 10x or other option so you can still take full advantage of the scrubber. This would also allow setting gross values quickly and then shifting to finer values to fine tune.