You did ask for perceived user-manual problems, so here is one for you.
Disclaimer: I may have misspelled something, or missed something obvious, but…
I don’t think the User Manual for 3.5 returns any useful results for “Double Sharp” or “Input Double Sharp”. There is an article about Respelling Notes, which I am not sure I understand.
The correct answer is in this forum post from the ever-helpful @Stephen_Taylor, which I naturally found through my old friend Google.