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I recently installed v19 and, when prompted, chose to transfer v18 customization. Some, but not all items transferred. Lisp files seem OK, menus and some workspace details not, for example. (I think the LISP files are specified with absolute file paths to a root-level customization directory and the other stuff may be relative and therefore transparently end up pointing at the v19 equivalents, I'll check on that)
Can I just copy v18's default.cui file to the v19 directory, and if so, will it turn off any new v19 features, lacking the relevant setting? If so, is there a list of the new features and corresponding variable names so that I can go turn them back on?
I'll also take a look at the CUI files and see if they're compatible with a differencer such as BeyondCompare or ExamDiff.