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