Easy change for developers to implement which will save a lot of time.
Currently the process of converting an Imperial family/project/template to metric or vice versa is very cumbersome. Particularly if you have do so with several items, which is a task all of us are met with very frequently.
One has to toggle through all the Unit options, that would be 7 categories and within each of these usually change at least two options. That is 14 clicks and changes for each instance. What happens then, is that users just change the "Length" category, leaving the family part imperial, part metric.
Please add this feature.