This one is for the non-English speakers. I’d love to finally have support for writing compound words in the many Germanic languages that require them (e.g. Norwegian, Swedish, Danish, German, and Dutch). The current spell check marks most compound words as incorrect because it only checks if the word exists in a pre-made list of words, which doesn’t work at all for compound word languages.
As everyone knows, they only have time to look into 1 issue per term.