Hi co3Dprints, 
re: 
> 1. by default not having the ratios linked on new objects (maintain proportions) when you want 
> to change the X axis length for instance.
 
If you put the attached file SetEditSizeMenuUniform.js into the appdata startup folder, you should then have "Maintain proportions" unchecked initially.
 
> 2. Sure there is a hotkey but switching units e.g. inches to millimeters would be great 
> as a button in gui.
 
It's in the UI under Options > General > "Unit system" .
  
> For instance when putting a caliper to something. I wish diameter was the default 
 
You can make diameter the default by editing moi.ini (Options > General > "Edit .ini file" button) and set: 
[Commands] 
<...> 
UseDiameterDefault=y
 
> <....> or have a simple toggle in that field that activates diameter input instead of radius.
 
There is a toggle for switching a radius field between radius or diameter input by clicking the label with the "cycler" arrow to the left of the field:
  
 
Hope that helps!
 
     - Michael  
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