Hi @Joshua_Kennedy ,
Because the ISO standard has a specific description for driving and reference dimensions it would be much better to adopt the same.
I think that will be better to have the driving dimensions as default dimension (this is what users will expect from a dim) and adopt the bracket for reference dimension like in ISO standard.
See this example I’ve found on the net:
The option to be a driving or reference dimension should be changed as a properties or by Right click