Hi JML82, yes you can enter diameter instead of radius if you want.

On every command that inputs a radius value, there is a little "cycler widget" shown in the Radius label like this:



That means you can click on that Radius label and change it to be a Diameter input instead.

It's also possible to edit a setting in the moi.ini file to make it use Diameter as the default instead of Radius. To do that, open the moi.ini file by going to Options > General > "Edit .ini file" button, then inside moi.ini find the line in the [Commands] that says UseDiameterDefault=n and switch it to say =y like this:

[Commands]
UseDiameterDefault=y

Hope that helps!

- Michael