LanguageTool lacks some check, that there is a space or a dot or some other punctuation mark after a quotation mark. I.e. it would be nice to have a check, that this is wrong:
“Good morning, Frank,”said Hal.
I think that it's rather easy to implement such check, if LT checks for repeated whites paces and space before a coma, why not check for other white space related errors/typos?