I don't know what you mean by "I also tried testing with a restore, and that did not update". What did you do here?
Thanks for catching the help file issue.
I don't think this feature is causing the spill file I/O issue but I can't explain why two people on Linux are getting it and I'm not. I've been using v28 for a very long time. I'm trying to run a release build (I usually run a debug build), keeping this feature on, and setting the spill file size to the smallest value possible (way smaller than the dialog let's you set it).