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I get your point Tom but still we are talking about something different.

Files I'm working on are usually 3-5GB because they are 1:1 set in 72 PPI

with my custom measurements scale (85px=3cm) measurement will give me the results I need.

We print in 72 PPI and we work in 72PPI unless its a business card or some smaller print.

For example:

I have a car set 1:1 from client but the file is 100PPI, my measurement scale will not work because on a square meter of 100PPI file much more pixels are contained.

I know I can turn off "resample Image" in Image size window, and measurements will be equal even if I set the PPI of 400. File dimensions in centimeters will change but measurements will be ok.

The thing is I need to send files to print in 72PPI, because they will not accept anything else.

Sorry If I still don't get you point  don't be angry, sometimes It's because english is not my native language, and I can misunderstood something