I am currently supporting an upgrade to 3dexperience 2024x and am performing an audit of the CATEnv to add/remove variables. Is there a good resource for useful ENV variables? 

Here is a free tip and a good example of what I am looking for. The variable ExportWithoutSaveSession=1 can be used to enable the export of objects that have unsaved modifications in session. This variable is documented in QA00000061105 in the knowledge base, but it is difficult to just stumble across it on your own.

Also, I know there is an ENV variable that will enable the Global Refresh command to add instances to an assembly that is being designed concurrently(typical behavior is to only modify or remove instances). It will probably take me some time digging through the knowledgebase to find this variable.