For the love of The Pond Gods!

Dear Unison Sync
It's all very well saying "add preference "dontchmod"" when using the GUI.
I had to figure out that you meant the [hidden] .prf file in .unison and then look at lots of search results to find out the actual format was: dontchmod=true after breaking it several times with the wrong syntax.

Why is there not an option in the GUI to perform that task?