Right click → 'Copy item name' is really useful (works in Crafting and Gathering windows).

It would be even more useful to have a matching right-click 'Paste' functionality for Search bars (Market Board, Crafting Log, etc).

Having only 'Copy' without 'Paste' feels like half of an idea. 'Ctrl+V' works (on PC), but it's more awkward than Right click → Copy → Right click → Paste, especially when I have one hand occupied (tabbing between windows, holding my phone/calculator, etc).