Could the fillet tool be improved to offer an option of live filleting? Here’s what I mean, demonstrated in Revit:
Ideally, you would be able to type the radius on the fly, so you can first visualise what would be an appropriate radius prior to choosing a numerically correct value. Perhaps, there could be an option to round to the nearest whole number, i.e. 7479 could become 7500mm or 7475mm depending on the rounding increment 100, or 25 respectively. That way, you would not have to type as much.