I did a small update to fix error message on 3dsmax start, when the default production renderer is not set to Corona.
In this case, you'll have your rendering settings automatically saved in PreviousRndrStngs.rps preset, then it will switch production renderer to Corona and load tweaker.
Also, updated Batch Material Editor to latest version.
How to install:
Extract zip to your 3dsmax scripts folder, drag&drop "register_Corona_Tweaks.ms" file to any 3dsmax viewport, then Customize -> Customize user interface -> Toolbars -> Corona Renderer -> drag and drop "Corona Renderer tweaker" button to your toolbar.